Little remains of the wooden ship but its cargo of earthenware amphora – ceramic vases – still remain stacked row upon row.
The vases, which originally contained olive oil and wine, are still tightly packed into the cargo hold as they were centuries ago.
Its cargo – one of the best preserved from an ancient wreck – has great historical significance and has an estimated value of £5m on the black market.
Croatian authorities are so concerned about looters plundering the valuable artefacts they have now protected the site – with a metal cage.
The heavy-duty cage features a large hinged door, which is kept locked with occasional access granted for divers under strict supervision.