1/7 UK waters are home to thousands of species but they're threatened by pollution.
2/7 These seals demonstrate the dangers dumped fishing nets can be to sea creatures.
3/7 Each year millions of balloons are thrown away, but birds often mistake them for food and can get their beaks tangled in the attached string.
4/7 Dolphins are one of many species that get tangled in fishing nets and other rubbish that is dumped into the sea.
5/7 The UK coastline stretches 10,500 miles. These grey seal pups were photographed off the Scottish coastline.
6/7 Wildlife groups estimate that around 1m seabirds and 100,000 marine mammals and turtles around the world die each year because of plastic litter. These plastic bags were removed from a sea turtle's stomach.
7/7 Earlier this year the wreck of HMS Scylla was sunk off the coast of Cornwall to create a new marine habitat. The ship was cleaned up to ensure it didn't create any extra pollution and is now an artificial diving reef.