thomas zurawski runs a diving school on gozo. he used to be a miner but these days he's an expert on the region's unique marine life. >> the advantage of the waters around malta is that we're right in the middle of the mediterranean, there's virtually no major industry here, no major rivers washing toxins and waste from the inland into the sea. and for me personally as a diver, i think it's great that there are no industrial fisheries operating here. >> but the crystal clear water does have one drawback -- it contains few nutrients. so divers around gozo won't get to see many fish. and many of the wrecks are just too far down. one way of creating more underwater attractions is to sink decommissioned ships. thomas zurawski documented the sinking of the first ship off gozo, 13 years ago. he and a team sunk the former ferry xlendi. their plan looked promising. but down on the sea bed, things went wrong. >> in the beginning we had to learn the hard way -- all we did was open the valves and let the vessels sink, keeping them in positi