|Transocean Actinia Semi-Sub|
|South Con Son Basin, Off Vietnam, South China Sea|
Built in 1982 by Hitachi Zosen at the Nagasu Shipyard in Japan, the Actinia semi-sub was originally owned by South Africa's Actinia Shipping before being hired out and eventually bought by Sedco Forex in 1997. She worked for BP in Vietnam, followed by service in Malaysia and Thailand for Total and Unocal before being moved to the Mediterranean in 1998.
In February 1993, the well being drilled by the Actinia encountered shallow gas and blew out, damaging the BOP and causing the rig to list by 15 degrees. The slick of ejected liquids measured up to 2 km wide. Reports state that the blowout subsequently killed itself, possibly by bridging.