Hecla-class hydrographical & oceanographical survey ship HMS “Hydra” at Auckland, New Zealand, mid-January 1975
Builder: Yarrow & Co. Ltd., Scotstoun, Glasgow
Displacements: 1,915 light, 2,733 full load
Gross tonnage: 2,898
Length overall: 79.3 m
Draft: 4.7 m
Engines: diesel electric: 3 x Paxman Ventura 12-cylinder turbocharged diesels connected to a single electric motor, 2,000 s.h.p.
Max. speed: 14 knots
Complement: 118
Commissioned 4 May 1966
Sold to Indonesian Navy 1986, renamed KRI “Dewa Kembar” (932)
Stilll in service as per November 2021