The Xlendi reef is situated right in the middle of the bay, with the inner reef going around the headland at a maximum depth of 12 metres, whereas the outer reef extends underwater from the headland. Part of the outer reef forms a pinnacle, which reaches up almost to the surface. There you’ll get to see octopuses, moray eels and many other fish species, while the base of the reef itself is covered with large boulders where posidonia seagrass grows in abundance.
On the other hand, the tunnel’s walls are bursting with colour thanks to the golden zoanthids, red starfish, bristle worms and purple, as well as green algae that covers the area. Shoals of jacks and barracudas are often spotted here. Bristle worms can be found everywhere, while pink flabellina is also very common. The light penetrating through the crack along its ceiling together with that from the exit creates a mesmerising effect fit for a picture.