Diving in the Indian Ocean

Barracuda schools circle Barren Island, home to India's only active volcano

Up to two hundred reef mantas barrel-roll inside a 200 m bay

Reef ends 30 m from shore and drops into 40 m visibility over 5,000 m of blue

Drift out on the falling tide as an entire atoll empties past you

Oman's first marine reserve, with whale sharks arriving each late summer

Tiger sharks cruise a cleaning station a few meters off the harbor wall

Permit-only Indian atolls with 30 m visibility and almost no divers

Manta feeding frenzies sweep into Hanifaru Bay when plankton blooms

Sunken wrecks and a cavern swim-through sit minutes from the Flic en Flac shore

Resident manta rays clean daily at Passe en S inside the barrier reef lagoon

Green, plankton-rich water and huge fish schools in the fjords of Arabia

Whale sharks feed in the channel toward Nosy Iranja each October through December

An atoll wall dropping into open ocean, 400 km from the nearest island

A recovering fringing reef and two easy wrecks on the sheltered west coast

A lagoon twice the island's size, with passes that flush it twice a day

Granite boulders stack into swim-throughs found nowhere else in the ocean

Red Sea, Arabian and Indian Ocean species overlap on unsurveyed reefs

Equatorial channels with stacked grey reef sharks and a wartime tanker

Coral gardens, a sunken aircraft carrier, and sperm whale superpods