Diving at the Inland Sea of Dwejra in Gozo: Complete Technical Guide
Dive Site Information Sheet
Site name:
Dwejra Inland Sea (inner area), Gozo
Dive type:
Shore dive in a cave, tunnel, and wall environment
Historical note:
According to the famous oceanographer Jacques Cousteau, this site was among his ten favorite dives of all time.
Seabed type:
Pebbles and rock inside the tunnel, large collapsed boulders, and vertical walls in the open sea.
Depth:
From 2 meters in the inner lagoon, descending through the tunnel from 3 to 26 meters, then exceeding 40-50 meters in the open sea.
Suitable for experienced divers:
Minimum level required is Open Water Diver for the initial area, but Advanced Open Water Diver certification is strongly recommended to complete the tunnel and explore the outer walls.
Recommended time of year:
From May to October for optimal and stable sea and weather conditions, although the site can be dived year-round depending on the winds.
Average water temperature:
Approximately 25-28 °C at the surface during the summer months and around 14-16 °C at maximum depth during winter months or below the deeper thermoclines.
Technical Tips
Properly planning your equipment for exploring the Inland Sea allows you to fully enjoy the spectacular contrast of light between the darkness of the canyon and the cobalt blue of the open sea. During the summer months, a 5 mm wetsuit provides ideal comfort, while during transitional seasons or winter, a semi-dry or drysuit is recommended to protect against colder temperatures and deep thermoclines. A dive torch is an essential tool for illuminating the tunnel walls, which are approximately 80 meters long, and spotting colorful sponges, corals, and small cardinalfish hidden within the rocky crevices. Regarding breathing gas mixtures, the use of Nitrox is strongly recommended for certified divers to extend bottom time and safely explore the majestic vertical walls and outer rockfalls that descend into the blue beyond the tunnel exit.
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FAQs ( Dwejra Inland Sea, Gozo )
Inland Sea Dwejra Gozo Diving Certification Guide
The minimum certification is Open Water Diver for the shallow initial section, but to pass through the entire tunnel down to 26 meters and enjoy the outer walls, the Advanced Open Water Diver level is strongly recommended.
What to See Inside the Inland Sea Tunnel at Dwejra Gozo
The vertical tunnel walls are rich in biodiversity, including colorful marine sponges, sea daisies, and schools of cardinalfish, while outside it is common to encounter amberjacks, barracudas, and groupers.
Boat Safety During Diving at Inland Sea Dwejra Gozo
The underwater tunnel is used by local fishermen’s boats to take tourists on excursions; for this reason, divers must maintain a deeper depth during transit and ascend close to the walls.
Freediving at the Inland Sea in Dwejra Gozo
Yes, the site is highly appreciated for freediving experiences thanks to its excellent visibility and the majesty of the tunnel, but maximum caution is required due to the presence of tourist boats on the surface.
Inland Sea and Blue Hole Dive Combination in Gozo
Certainly, due to the close proximity within the Dwejra area, many diving schools organize a daily excursion that includes a first dive at the famous Blue Hole and a second dive at the Inland Sea.
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