world ahead of the commonwealth games in australia. and not one, not two, but three boaty mcboatfaces. the little yellow submarines, named by the public, set off on their first scientific expedition. and carol has the weather. thank you and good morning. they call thank you and good morning. they ca ll start thank you and good morning. they call start to the day with frost around first thing and we have a wea k around first thing and we have a weak weather front sinking south bringing cloud and patchy rain. for most of us it will be dry and right with sunshine. more details in 15 minutes. good morning. first, our main story. the legislation paving the way for theresa may to begin the formal negotiations for withdrawing britain from the european union faces its final test in parliament today. ministers hope mps will reject the two changes made to the brexit bill in the house of lords. peers want to guarantee the rights of eu citizens in the uk and ensure parliament has a vote
reporter: if something catches their eye, the navy will send down a high resolution camera on the bluefin 21. it can take black and white photos, covering about 15 square miles a day. it s a slow process, moving at just 3 nautical miles per hour. only made worse by horrendous conditions, freezing temperatures, mountainous terrain and complete darkness. but even diving blind, there is much hope the bluefin 21 auv will see something. randy kay, cnn, quincy, massachusetts. i m carol costello. thanks for joining me at this hour. this hour with berman and michaela starts now. back-to-back obstacles in the underwater search for flight 370. the robotic submarine s first deep dive is aborted, cut short, due to the ocean depth. the return to the sea floor delayed now due to weather.
The indian ocean for the search for the plane. the first came up empty. how does the bluefin 21 work? randi kaye went out to the boston harbor with the firm that makes the submarine to find out. reporter: on board the rv resolution in the boston harbor. we have come here to see for ourselves how the bluefin auv operates. they are the tool you would use to conduct a wide-area side-scan survey in deep water. reporter: bluefin robot innings designs and builds the autonomous underwater vehicles in quincy, massachusetts. if this were a mission, a real mission what it would it be doing? the next thing would happen, the radio instructions received to the red antenna there the vehicle say, okay, start this mirkts propeller would spin up and dive. reporter: here in the boston harbor, the water only 40 feet deep, easily manageable for the
Ocean will begin once the weather clears up. like the searches for flight 370 and the passengers, the first trip for the bluefin turned up nothing. the submarine s 7 1/2-hour mission found no objects of interest plus the mission ended early when the subpassed its maximum operating depth. for more on these developments, erin mccrosswalk lynn is in perth, use trail ya. reporter: hi. we are told nothing happens quickly waters this deep and with the bluefin s first mission cut short, that certainly seems tonight case. breaking overnight, u.s. navy officials say no objects of interest were found among the data downloaded from their unmanned underwater robot. this as the first mission was cut short. 7 1/2 hours into the mission, the bluefin 21 was forced to return to surface early.