The Songa Mercur was a semi-submersible drilling rig designed by Friede & Goldman, ex Shelf 10 and La Muralla.

It is capable of drilling in water up to a depth of 1,200 feet (370 m).

[2][3] In May 2006, Songa Offshore signed a nine-month contract with Chevron to use the rig in Australia.

[2][5] In 2013, the rig was contracted by Idemitsu Oil and Gas for drilling off Vietnam.

[6] In 2014, Songa Offshore sold the rig to Opus Offshore as a part of the deal creating Songa-Opus joint venture.