Free diver taking a look at soft corals. Shark and Yolanda, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Crown-of-thorns starfish (Acanthaster planci). Ras Ghozlani, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Blacktip shark (Carcharhinus limbatus) in the blue with diver. Species Near threatened. Shark and Yolanda, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Long-arm cleaner shrimp (Periclimenes longicarpus) on a Bubble anemone (Entacmaea quadricolor). Shark Observatory, Sharm El Sheikh, South Sinai, Red Sea, Egypt. (rr)

Bearded scorpion fish (Scorpaenopsis barbata). Jackson Reef, Sharm El Sheikh, South Sinai, Red Sea, Egypt

Blacktip grouper (Epinephelus fasciatus) Jackson Reef, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Wave wart slug (Phyllidia undula). Ras Ghozlani, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Fringed blenny (Mimoblennius cirrosus) hiding in the coral. Na'ama Bay, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Divers heading out for a dive. Ras Katy, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Blacktip shark (Carcharhinus limbatus) in a school of Great barracuda (Sphyraena barracuda). Species Near threatened. Shark and Yolanda, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Blacktip shark (Carcharhinus limbatus) Species Near threatened. Shark and Yolanda, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Blacktip shark (Carcharhinus limbatus). Species Near threatened. Shark and Yolanda, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Net fire coral (Millepora dichotoma). Shark and Yolanda, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Broccoli coral (Dendronephthya klunzingeri). Jackson Reef, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Red cup coral (Tubastrea coccinea) Na'ama Bay; Sharm El Sheikh; South Sinai; Red Sea; Egypt.

Bubble coral (Plerogrya sinuosa). Na'ama Bay, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Hawksbill turtle (Eretmochelys imbricata) Species Critically Endangered. Woodhouse Reef; Sharm El Sheikh; South Sinai; Red Sea; Egypt

Red Sea mimic blenny (Ecsenius gravieri). Na'ama Bay, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Twin-spot snapper (Lutjanus bohar) at cleaning station. Shark and Yolanda; Ras Mohamed National Park; Sharm El Sheikh; South Sinai; Red Sea; Egypt

Bullethead parrotfish (Chlorurus sordidus). Na'ama Bay, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Green turtle (Chelonia mydas) at night. Species endangered. Na'ama Bay, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Yellow lip shield slugs (Chelidonura flavolobata). Na'ama Bay, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Red Sea anemone fish (Amphiprion bicinctus) in Haddons's anemone (Stichodactyla haddoni) Na'ama Bay; Sharm El Sheikh; South Sinai; Red Sea; Egypt.

Blacktip shark (Carcharhinus limbatus) Species Near threatened. Shark and Yolanda, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Diver observing coral wall. Shark observatory, Sharm El Sheikh, South Sinai, Red Sea, Egypt.