Diving in Tunisia is generally shore-based in Tabarka, Cap Bon and Hammamet. There is a WWII wreck to discover off the coast of Hammamet, colourful underwater fauna in Hergla, archaeological sites in Mahdia, hidden caves in Djerba, as well as beautiful grouper fish near Port El Kantaoui.
Tabarka - Tunnels Reef covers 500m and contains 20 tunnels you can swim through. Cap Bon open up to deep waters. Visibility is excellent here but it is for experienced divers only. The sites are varied and rich in Mediterranean fish varieties: groupers, murenes, gorgonians, coral, mullets, octopuses.
Hammamet - a number of wrecks, several of them dating from WW2 including German and Italian vessels. Some still have their cargo - jeeps and motorcycles.