Inland Sea & Tunnel Dive – Gozo’s Unique Shore-to-Open-Sea Experience

Overview

The Inland Sea & Tunnel dive in Gozo is one of the most distinctive shore dives in the Maltese Islands, offering a rare transition from a calm inland lagoon through a long underwater tunnel and out into open Mediterranean sea. Located at Dwejra on Gozo’s west coast, this site is frequently paired with the nearby Blue Hole and forms a cornerstone of most Gozo diving itineraries.

What makes the Inland Sea special is not depth or marine density, but experience. The dive combines controlled conditions, overhead awareness, navigation, and exposure to open water in a way that suits a wide range of divers — from confident Open Water Divers to advanced recreational divers refining situational awareness and dive planning skills.

For Malta-based dive centres, the Inland Sea provides an ideal natural contrast to Malta’s wreck diving, allowing divers to experience both environments within the same trip.

Dive Summary

Access: Shore
Depth Range: 6–30m
Certification Level: Open Water → Advanced
Dive Type: Lagoon / Tunnel / Reef
Typical Visibility: 20–40m
Experience Level: Beginner-friendly with advanced options

Geological Setting & Site Layout

The Inland Sea is a naturally enclosed saltwater lagoon, separated from the open sea by a rock wall. Entry is made directly into the lagoon, where depths remain shallow and conditions are usually calm.

At the far end of the lagoon, a long underwater tunnel — approximately 80 metres in length — connects the Inland Sea to open water. The tunnel is wide, non-restrictive, and gently sloping, making it suitable for recreational divers when dived correctly.

On exiting the tunnel, divers emerge onto a sloping reef and open-sea environment, where depth increases gradually and visibility often improves dramatically.

Dive Profile & Typical Routes

Most dives begin with a controlled descent in the Inland Sea to around 6–8 metres, allowing divers to adjust buoyancy and confirm equipment before proceeding.

From there, the dive continues through the tunnel at depths of approximately 10–15 metres, depending on route and conditions. Ambient light is present throughout the tunnel, but torches are recommended to enhance visibility and awareness.

Once outside, divers typically:

• Explore the reef and wall area between 18–30 metres

• Follow the reef either north or south depending on conditions

• Return through the tunnel to the Inland Sea for a calm ascent and exit

This out-and-back profile makes navigation straightforward while still providing variety and interest.

Marine Life & Visibility

Marine life in the Inland Sea itself is limited due to reduced water exchange, but increases significantly once divers exit the tunnel.

Common sightings include:

• Damselfish and wrasse along the reef

• Octopus and cuttlefish near rocky ledges

• Groupers and bream in open water

• Occasional pelagic species beyond the reef

Visibility is typically excellent outside the tunnel, often exceeding 30 metres, especially in calm summer conditions.

Conditions, Weather & Seasonality

The Inland Sea is highly dependent on sea conditions, particularly swell from the west. While the lagoon itself may appear calm, surge can be present within the tunnel and at the tunnel exit.

This site is best dived:

• In settled weather

• With good surface conditions

• Under guidance from local professionals familiar with the site

When west-coast conditions are unsuitable, alternative Gozo or Malta sites are often selected instead.

Entry, Exit & Logistics

Entry is made via a slipway into the Inland Sea, making access relatively straightforward compared to many rocky shore sites.

Exit follows the same route, with the calm lagoon providing a stress-free environment for controlled ascents and safety stops.

Because of its popularity, the site can become busy during peak season, reinforcing the importance of timing and good dive management.

Training & Experience Value

The Inland Sea is widely used for training because it allows instructors to introduce multiple skills in a single dive:

• Buoyancy control in confined but open water

• Tunnel navigation and overhead awareness

• Light management and communication

• Transition from sheltered to exposed environments

It is commonly included in:

• Open Water continuation dives (conditions permitting)

• Advanced Open Water training

• Navigation and adventure dives

Who This Dive Is Best Suited For

Ideal for:

• Confident Open Water Divers

• Divers new to tunnels and caverns

• Photographers seeking unique compositions

• Divers looking to expand experience beyond reefs

Less suitable for:

• Divers uncomfortable with overhead environments

• Days with strong swell or surge

Local Knowledge & Tips

• Always assess conditions inside and outside the tunnel

• A torch significantly improves situational awareness

• The site pairs exceptionally well with the Blue Hole on the same day

• Patience at the tunnel entrance avoids congestion and improves safety

Related Dive Sites

• Blue Hole – Gozo’s most iconic shore dive

• Reqqa Point – Advanced wall diving nearby

• Wied il-Ghasri – Sheltered alternative in rough conditions

• Coral Gardens – Colourful shallow reef option