Video: Descending: filming the world's best dive sites The SS Yongala was a luxury steamer in 1911 and is a shipwreck on most divers" bucket lists - a popular spot sitting 109m below the surface off the coast in Queensland, Australia. Visit with Adrenalin Dive (www.adrenalindive.com.au), which offers day trips and live aboards. Or try Thistlegorm, in the Red Sea, a cargo ship where you can explore sunken trucks, motorbikes, train carriages and the captain's cabin (with its own toilet). Finally, Tulamben, off the coast of Bali, is a fairly easy, rewarding wreck in shallow water, attracting a host of sea life. Hammerhead sharks The distinctive silhouette of schooling Hammerheads from below is a truly memorable sight. The El Bajo site near Los Islotes in Baja California is a good place to try and catch them. Schools range between six sharks to hundreds. The Cortez Club (www.cortezclub.com) is a dive centre based in La Paz, Mexico. Manta rays A night dive with underwater lights at the Kailua Kona site in Hawaii is a thrilling way to spy mantas, with the majestic creatures lit up as they glide through the beams, feeding on plankton. In the Komodo National Park, Indonesia, there are a couple of sites that mantas frequent, such as Manta Ray Alley. The best time to go is during the rainy season when you may catch them schooling. Reefseekers (www.reefseekers.net) takes boats out around the national park and has accommodation at the Angel Island Resort on the beautiful island of Flores. Seahorses One great muck diving site is the Lembeh Strait in Indonesia, where little critters including everything from neon-striped nudibranches and pygmy seahorses, to ornate ghost pipefish, can be seen. Froggies Divers (www.froggieslembeh.com) is a well-respected dive company with eco-friendly bungalows in Lembeh. Great white sharks Not for the faint-hearted, cage dives grant you terrifying nose-to grizzled-nose encounters with a great white shark. The best place to see them is in Cape Town, South Africa. SharkCageDiving.Net (www.sharkcagediving.net) has day trips on board a shark chaser boat based near Gansbaai, that involve surface viewing and a descent in a cage, from £90 for adults. Jellyfish Before you ask why you might want to swim within touching distance of jellyfish, at this lake in Palau the pulsing jellies have no sting. And there are hundreds of them, making a snorkel here an otherworldly experience. The lake is found on Eil Malk island and the company Sam's Tours (www.samstours.com) offers trips. Turtles Turtles are a common sight on many dives but to see them in great numbers try Turtle Canyon in Hawaii, where you should be able to swim among at least a dozen of them. The area doesn't receive many currents and so is good for beginners. Waikiki Diving Centre (www.waikikidiving.com) in Honolulu can take you there.