These pics were taken for an underwater photography competition, and the Wildlife Trust chose the British and Irish winners. This one is a spider crab on a peacock worm...
The Wildlife Trust is trying to get better protection for animals in the sea and around the coasts of the UK.
These photos were taken by adults but they also have a junior branch of the Trust called Wildlife Watch that has 135,000 members. This picture is of a flounder.
Underwater photography is pretty popular in Britain - there's even a society for it called British Society of Underwater Photographers. This pic is of a cuttlefish.
Usually underwater photographers take pictures when they're scuba diving, but you can take them when you're snorkelling or swimming too. Don't forget you need a special camera!
This photo by Helen Wehner is of a shanny which is a small fish that lives in rockpools. "I was able to stick my head under the pool and take some shots in less than two feet of water."
Trevor Rees took the runner-up photo of a spider crab.
And the winner of the competition was Arthur Kingdon who took this pic of a black-faced blenny.