police in derbyshire have arrested a man as part of a murder investigation after four people were found dead at a house in killamarsh near sheffield on sunday. two children were found dead at the house along with their mother and another child. danny savage reports. it was early yesterday morning when police were called to this semi—detached house in killamarsh. they discovered the bodies of three children and a woman. today, 13—year—old john bennett and his 11—year—old sister lacey were named as two of the victims. they are pictured here with their dad, jason. ijust don't know how he's going to even come through this... his parents visited the scene today and stopped to talk to reporters. they are devastated at the loss of their grandchildren and are supporting their son. they were the most well—mannered children you'd ever meet. yeah. as kids nowadays, they were well—mannered. they always remembered their manners, they always pleased and thank you'd. if you ever brought them a present, the first thing they did was go on facebook and to thank you. i don't know how we're going to manage without them. no. jason bennett said on facebook... terri harris, the children's mother, was 35 years old. the third child who died was 11—year—old connie gent from sheffield. she was lacey's friend, staying here on a sleepover. a 31—year—old man arrested yesterday remains in police custody as specialist officers continue their investigations. danny savage, bbc news, killamarsh near sheffield. now on bbc news, it's the travel show, with mike corey. this week, on the travel show... i'm in argentina, exploring an amazing sunken town that has reemerged from under the water. then, i head to the country's spectacular iguazu falls. and in wales, wejoined a couple starting out on a pedal powered adventure at sea, searching for a more sustainable future. we're kicking off this week in south america — argentina, to be precise — where early last year i went to explore one of the strangest places i had ever heard of. a town that had to be abandoned due to flooding back in the 1990s, but has since reemerged from beneath the water. you can find ghost towns all over the world, and as many different reasons why they could be abandoned, but i've heard epecuen is special because it is not abandoned — at least not completely. there's not much left... just some bricks. you can only guess what they used to be. this places is wild. there's a couple of tourists here, notjust us. well, more cows than tourists. epecuen was built in the 1920s, and at its peak was home to about 5,000 people. tourists came from all over argentina to take a therapeutic dip at its famous thermal baths. today, they come for a very different reason. viviana, a former resident, leads tours around the remains of her hometown, explaining what happened here. how did it become abandoned? how did it come to this? in 1985, heavy rain and storms sealed epecuen�*s fate. a nearby dam ruptured, and within weeks the town was flooded. for years and years, the water continued to rise, and by the early �*90s, everything you see here was completely submerged. then just over a decade ago, the waters began to subside. now tourists can walk the streets once again. this looks damaged, but it's not, it's completely encrusted in mineral salts from the water. the inside, not so great... i guess that's what a quarter of a century underwater does. for me, ijust see concrete, but you, you have memories here. but even when it was mostly underwater, it wasn't entirely abandoned. for over 25 years, a local legend called pablo novak lived on the outskirts. some recent health complications have meant that pablo has had to move out of his home and into a nearby nursing facility. that means epecuen�*s last resident has finally moved away, but pablo�*s memories of the town still live on. while epecuen may now be fully abandoned, what is left behind is a uniquely desolate, stunning landscape with a legacy that will never be forgotten. next, we're off to new zealand to visit the north island's largest rainforest. back in 2014, the government returned ownership of the land back to the local indigenous people who are now encouraging tourists to learn to interact with the forest on a spiritual level, rather than just think of it as a great place to take a hike and some photos. this tribe, my tribe, fought for 150 years to have land returned to the people, and they were eventually successful in 2014. what was formerly the national park area, became a living entity of its own with all the rights of personhood. and i believe that was the first of its kind in the world. we don't take over and control, they understand where they fit in, and are guided by nature. this tree, it is supporting me, and the energy from it feels male. it's a few hundred years old, whatever tree your eyes alight upon, there is that thing acknowledging you and saying hello. if you ignore them, itjust means that you need more time, so more time spent in nature, the more you tune in, the better developed your understanding of the language that she's speaking to you. people that i met when it was a national park often didn't know much about the tuhoe tribe, or our indigenous ancestry. children of the mist. the retreat was born out of the desire to have a place where people could stay in nature, enfolded in nature, where they could connect with nature and themselves. you are unplugged from the distractions of life. i want people to realise that you don't need much to enjoy life, and to live. staying here strips back and takes you right back to the basics of what you need, what the body needs, what the spirit needs. still to come on the travel show... i get to experience the spectacle and sheer force of nature of the amazing iguazu falls here in argentina. and we meet the couple setting out on a sustainable journey at sea with the help of a little pedal power. so don't go away. this isn'tjust one waterfall, it's hundreds. iguazu is three times wider than niagara, and it's a marvel of nature right on the border between argentina and brazil. i've been wanting to see this waterfall my entire life. during the rainy season, every second, up to 13 million litres of water spill over a series of precipices stretching 1.5 miles wide. the first time that i saw the waterfalls i cried. the falls are steeped in local legends. though some are more sinister than others. they believe that behind the waterfalls, especially behind the devil's throat, there is a giant snake living there, and they have a big respect about that. have you seen a giant snake? never, but i have seen the devil's throat and i have a lot of respect about that that. devil's throat is one of the most spectacular sections of the falls, where a major portion of the iguazu river tumbles over, causing an effect similar to an ocean plunging into an abyss. wow! i've never seen anything like this before! 0ne waterfall, two, three, four, five, six, 20, 30, 100, all cascading down. the rush coming off this waterfall... laughs. you can feel it on your face and hands, this is an incredible wonder of nature. you have to come and see this some time in your life. wow. next, we join the husband—and—wife team, jason and tammie, on an incredible zero carbon adventure around wales, and so far they have completed almost 400 miles over hills and valleys under their own steam. now, it's time for them to tackle the spectacular and sometimes precarious welsh coastline in a boat powered just by pedals. we are on a circumnavigation of wales using just human power, so we're biking, we're walking, canoeing, pack rafting and using a specially designed pedal—powered boat. moksha is an 8 metre by 1.5 metre boat made out of wood, that was designed and built back in the early �*90s to complete the first circumnavigation of the planet by human power, which is what i did, started off with a friend, and she's like almost a part of me, she's like part of my soul now, i've spent so much of my life in her. like i'm ever gonna wear this. i think for me, human power means being able to be more part of a community, and i think one of the most special things about our journey so far is the fact that we're going very slowly, we are meeting some amazing people that we would have never met. some of the most engaging encounters in terms of people and leading onto sustainability stories which is what we're interested in exploring here in wales, have come about because of human power. so we biked from greenfield dock up on the dee estuary, to hay—on—wye, then we hiked over the black mountains, used pack rafts down the river monnow to monmouth and then we've just biked the last 300 miles from monmouth to here, milford haven. so tomorrow we're going to be pedaling moksha, our pedal boat, out into the channel essentially, around the corner, around the pembrokeshire headlands and then around to fishguard, up cardigan bay, around by anglesey and back to where we started from, from greenfield dock there on the dee estuary. thank you! i can't deny that i'm more apprehensive about this than crossing an ocean, which i have done in that pedal boat, several times. but this, going around the coast, you've got tides, you've got wind, you've got other vessels, there are so many other variables and that's what i'm, that's what i'm most nervous about. seems pretty rough water coming up there. i'm very nervous, because when he gets nervous, it really does freak me out. oh my god! whirlpools? suspenseful music plays. 0k, can you see me? bring the... no, up, u ! no, up! p stop! dammit. bleep yeah, i'm just shattered. absolutely shattered. i'm not in my comfort zone on the water, but honestly for me, it's telling the stories of the local heroes that are championing, you know, their local environments and the seals and the whales and they're out there and they're in the trenches every day working hard and they're fighting bureaucracy and i'm so excited to bring those stories to other people so that they can get help, and i'm really, really excited about that. we have heard about this amazing organisation called the sea watch foundation, and jason and i are super excited, we're going to get out on a boat to see if we can't find some dolphins and other sea life, so we're looking forward to it. katrin, what exactly is it that the sea watch foundation does? so, the sea watch foundation is a nation wide research charity, we study whales, dolphins and porpoises in the uk. 0ur flagship project is the cardigan bay monitoring project, which is the project that i lead, and we study the semi—resident population of bottlenose dolphins that we get around here, and we look at how they use their habitat and how many animals there are, year after year. so today we're not actually on a surveying boat, we're on a tourism boat? yes. can you explain, is that a problem for the dolphins? well, it's a difficult situation. when we look at northern cardigan bay, where there's actually a lot less tourist boats, we have seen an impact of disturbance and that's mainly from recreational boat traffic. and we've seen an effect in the social structure of the dolphins there. so down here, we have much smaller pods with longer lasting bonds, whereas up north the animals are often in bigger groups, but they have less long lasting bonds between each other. you just can't get away from it, can you? can we park on the flat part of the ocean from now on? this sounds ridiculous, but if i threw up and something eats it... i've had an ibuprofen and stuff today, i mean, ijust don't... retching. so sick... it's like being inside a washing machine. so how was your night? it was ok... rolling... well, as soon as we get under way, it will be not this continual rolling. honestly, we make a good team, and it's funny because we fight about little things that, you know, i think we can't even remember what we fought about. whoa! oh, god, ow! yeah, we do fight but weirdly enough when we are out at sea or if we're on this expedition together... if we think we're gonna die, we're fine! why can't one thing be easy? just one? i suppose when the chips are down and when things are going really badly, that's when we come together and work really well together. thank you. you're welcome. tammie�*s cafe at sea. food waste is a huge problem. yeah. 40% of our food in this country is wasted so we're gonna go and find out how this local group is preventing food from going to landfill, so they pick up food from restaurants, from people's houses and a lot of it's not gone off, it'sjust gone past the best—before date so then they make delicious food, and we are tired of eating brown food on this boat, so this is going to be great, eating food other than our own cooking. it's reallyjust a great concept because they're feeding their local community, and then anything that they can't use actually goes into a compost bin, so it is literally a complete circular economy with food that would be otherwise wasted. that's delicious! well, that's all for this week. but coming up next week... what we're trying to do here is get around this headland before the tide turns against us, but it looks like the tide has already turned. we're back with tammie and jason as they continue their voyage, but with the weather closing in, will they get to their final port of call or have to abandon their mission? you're not going to want to miss it. but until then, from me, mike corey and the rest of the team here, at iguazu falls in argentina, it's goodbye. hello there. for central and southern parts of the uk this week, it's not looking that bad at all. with high pressure always nearby, it'll be dry, quite warm with plenty of sunshine. but we'll start to see some changes from wednesday onwards across the north of the uk, more especially for scotland, where it will turn windier with some rain at times and it will feel cooler. so, a bit more of an autumnal feel there. high pressure, though, dominates the scene into tuesday, many places starting dry. there will be some mist and fog around, some dense patches across east anglia and the southeast which will tend to dissipate through the day. bit of mist and fog to start the day for scotland and northern ireland, and then it'll turn cloudier and windier for western scotland, perhaps western northern ireland, with some light and patchy rain here. but eastern scotland, eastern northern ireland, most of england and wales, fine and dry with some sunshine. and again, quite warm, into the low 20s celsius. into tuesday night, it starts to turn cloudier, windier and wetter across the northwest of the uk. further south, closer to high pressure, winds will be lighter, some clear spells again, one or two chilly spots, but a bit milder further north and west. this is where we start to see the changes, then, around the middle part of the week. indeed, it's on cue during the autumn equinox, with some rain and strong winds pushing in to scotland, northern and western areas, and then this band of rain will move southwards into northern ireland, southern scotland later in the day. behind it, sunshine, blustery showers, gales here. to the south of this rain band, though, for the majority of england and wales, another fine day to come. quite warm, top temperatures of 22 or 23 degrees. as we move into thursday, another area of low pressure skirts the north of the uk. that'll bring another swathe of wet and windy weather across scotland, maybe some gales later in the day. a bit more cloud further south, but again, for much of england and wales, the midlands southwards, it'll be dry with some lengthy spells of sunshine, top temperatures 20 or 21 degrees. but cooler in the north, 10 to 16 degrees here — particularly chilly when you factor in the wind. through friday and into the weekend, we start to see the winds change direction. low pressure develops to the west of the uk. that draws up some mild south—westerly winds across the uk, but we'll start to see some wet weather pushing into western areas as we reach part two of the weekend. but again, across the south, it could stay dry with plenty of sunshine. this is bbc news: i'm david eades. our top stories: votes are being counted in canada's snap general election. local media projectsjustin trudeau will stay in power. 0pening its doors — after more than 550 days, the us announces it'll end its ban on international air travel for fully—vaccinated foreign nationals. we have a special report from afghanistan on the dire conditions, the un says, are leading to a humanitarian disaster. and hailed as a hero for saving lives in the rwanda genocide — paul rusesabagina faces years in prison for terror—related crimes.