HMS Thetis was a 24-gun sixth rate that the Royal Navy captured from the Dutch at Demerara in 1796 and later scuttled there. She was a Dutch 7th Charter frigate built at Amsterdam and launched in 1785. Her dimensions, in Dutch feet of 11 Rotterdam inches, were: 125' 7/11" x 34' x 13' 2/11".[2]
HMS Thetis (N25) was a T-classsubmarine launched in 1938. She sank during trials but was salvaged and recommissioned as HMS Thunderbolt. The Italian corvette Cicogna sank Thunderbolt in 1943.