From Calantopio et al.  2020:</br>The case study of this research is Mandalay MHT , a
34 m long steel-hulled auxiliary schooner that sank in 1966.
Mandalay was designed by John G. Alden Naval Architects, Inc.</br>
(https://www.nps.gov/bisc/learn/historyculture/upload/Mandalay.pdf)</br>
and built by George Lawley & Son, Corp. in 1928. After being
sold in 1931 and renamed Valor, it had subsequently five other
owners until it was purchased by Windjammer Cruises, Inc.,
refitted, and renamed as Mandalay in 1965, for being used as a
luxury cruise ship. The vessel ultimately sank on Long Reef at
the end of a 10-day Bahamian cruise, the 1st of January 1966. The
Mandalay now rests in very shallow water (maximum depth of 6
meters), and it is an outstanding snorkelling underwater site
located in Biscayne National Park (25d 26.530 N, 80d 7.301 W);
Biscayne was established as a National Monument in 1968 and
designated as a National Park in 1980. The park is dedicated to
the public enjoyment and preservation of cultural and natural
resources, the protection of a rare combination of terrestrial and
undersea life, and the preservation of a scenic subtropical
setting.