Sector 7 (2011)
Pretty good monster movie about an oil rig, a petroleum-based aquatic creature and a cute final girl. 6.5/10
7 gwanggu (2011)
Trailer...
https://www.youtube.com/watch?v=yFMVaGz-hAQ
Similar movie group:
Deep Star Six 7/10
The Host 7/10
The Intruder Within 7/10
Sector 7 6/10
Proteus 6/10
The Rig 3/10
The Thing Below 2/10
https://www.youtube.com/watch?v=YxYvzVxJtYM