'Cycle War' was taken in Egypt and shows Norton 16H motorbikes loaded in the SS Thistlegorm, with soldierfish schooling above.
The competition had 11 categories, testing photographers with themes such as Macro, Wide Angle, Behaviour and Wreck Photography, as well as three categories for photos taken in British waters
Abdul Rahman Jamaludin's image of sea slugs features a surprising backdrop of a moray eel, which swam into the reef as he was taking his image.
Leicester-based Tony Stephenson managed to find these pike in the quarry at Stoney Cove, a popular scuba diving site.
When a whale is spyhopping, it emerges from the water vertically, pausing in its position. Greg Lecoeur captured this humpback as it moved its pectoral fin towards the camera.
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Shane Gross's photograph was taken in a pond with a very high density of seahorses, yet he was still amazed that he managed to capture these three together, backlit and surrounded by plankton.
Shark behaviourist Cristina Zenato has been studying Caribbean reef sharks near Freeport in The Bahamas for more than 24 years. The unique bond between her and the sharks allows her to get close to them, enabling this impressive image by Fan Ping.
Although Songda Cai has had many encounters with eels, this is her favourite image of the creature, looking at her camera from inside its coiled body.
A fish had managed to wedge itself between the bell and the tentacles of a jellyfish, and the two were moving along together. This strange combination turned towards Scott Gutsy Tuason after he had taken 20 photos, and he was able to get this fantastic shot.
It took two days of standing in shallow waters from 05:00 to 08:00 for Filippo Borghi to get this image of a cormorant diving for fish in the Izu Peninsula, Tokyo.
Tanya Houppermans swam on her back underneath this sand tiger shark, trying not to startle it as millions of tiny fish swam around it. As she moved with the shark through the water, the fish parted and the underside of the shark was revealed.
These humpback whales were swimming by the Haʻapai islands of Tonga when Simone Matucci and his wife were diving. "It was the most wild and incredible thing I have probably witnessed in my entire life" he says.
