Inland Sea Tunnel
Depth is the range from the top of the site to its usual maximum; "recommended cert" is the mainstream-agency level operators usually ask for, not a legal rule. Currents and visibility change daily, so treat everything here as planning ranges.
The Inland Sea is a pebble-ringed lagoon sealed off by Gozo's cliffs, connected to open water only through a narrow slot a boat's width across, and divers ride that geology like a corridor into another world. The tunnel runs about 80 m, deepening as it goes, its final frame a burning blue rectangle that ranks among diving's great doorways. Outside, walls drop past 40 m into cobalt water where amberjack and dentex sometimes patrol. The return swim aims back at a keyhole of daylight. Timed between tour boats and swell, it is a short dive that stays in memory for years.
The moment you come for: The 80 m tunnel, the blue exit frame, big walls beyond the cliff
Topography: An 80-meter natural tunnel through the cliff, floor stepping from lagoon shallows down to about 26 m at the sea exit, opening onto steep walls
Entry: Enter the shallow lagoon by the fishermen's boat huts at Dwejra and follow the tunnel seaward: small tour boats use the same passage, so depth discipline and listening for engines matter.
Know before you splash
Hazards: Boat traffic in the tunnel overhead, darkness mid-passage, and swell funneling through in unsettled weather.
Conservation: Shared, protected space at Dwejra: give the tour boats the surface layer and the tunnel walls their fragile growth.
Who you'll meet
"Charted here" species were listed by our editors from the sources on this page. Counts are GBIF occurrence records: observations logged within about 5 km of the charted position since 1990, matched only against the species in our catalogue. They show what has been seen there, not a promise of what you will see.
For photographers
Wide angle: ★★★★★ · Macro: ★☆☆☆☆ (editors' 1–5 rating of what this site gives each style of shooting)