South of Pattaya and Jomtien is the "navy town" of Sattahip. This is the main base of operations for the Royal Thai Navy, and all of the islands around here, as well as the far islands off Pattaya, are managed by the navy. In most cases, landing on the islands is not permitted, but there is generally no problem diving on authorized sites.
The bulk of the dive sites are around the islands south of Samaesan cape. The largest of these islands is also called Samaesan. There are several wreck among the popular dive sites. One not shown is the "vertical wreck" of a gas tanker sitting on its stern. It's an interested, but very technical, dive in open water several hours from Pattaya.