The areas surrounding the island of Grado are particularly good for those who wish to start a gradual approach to underwater diving; in fact, Grado’s sea does not call for the necessity of decompression and serves as a sort of ideal gym for beginners because of the fact that is not particularly deep.
Despite the fact that the Adriatic Sea floor is particularly flat and sandy, this area of the sea has some real surprises, with its remains from the roman epoch and those from the world wars, or even with its "trezze", little oases of natural rock cliffs which rise up from the sandy bottom for a few meters, which can measure from only a few square meters to a few hundred square meters, and which serve as an ideal spot for the diverse species of marine life which populate the Adriatic to hide and for the diver to take photos of the underwater life.   http://www.gradesesubacquei.it/index.htm