Lady Thetis was a Cypriot passenger ship sunk for use as a recreational dive site in the Mediterranean Sea off Limassol Cyprus.
She used to be named Reiher and was employed as a coastal passenger vessel. She was built in Hamburg, West Germany in 1953 and was registered in the Register of Cyprus Ships in 1990.
Lady Thetis was sunk off Limassol in February 2014 along with the fishing vessel Constandis to serve as a recreational dive site. Lady Thetis lies in approximately 18 meters (59 feet) of water and has a number of easy swim-throughs and also penetration options for the more adventurous divers. During its sinking the wreck dug into the seafloor, thus a deeper depth than the seabed can be achieved inside the wreck close to the keel. A decompression trapeze can be found at the stern of the wreck at 5 meters (16.5 feet), 30 to 40 meters (98 to 131 feet) from the wreck buoy.