this is 0utside source live from the bbc newsroom. 0ur lead story is the uk has introduced tougher virus restrictions to slow the spread of the 0micron variant in england, including mask rules and a mandatory covid pass at big venues. now something we don t bring you everyday on 0utside source. i wonder if you can guess this sound. growling. that, in case you didn t guess, was a recording of fish growling, whooping and croaking on a coral reef in indonesia. the discovery was made using underwater microphones, which these researchers used to listen to the reef after it was re seeded with new corals. and it s significant because we re told the sounds mean the coral is coming back to life. well, the diver in the picture you can see here is lead researcher dr tim lamont. and he s been speaking to the bbc.