Bohai petroleum training center. The five certificates of offshore platforms need to be registered, paid and trained in Bohai Petroleum Training Center of China Offshore Oil Corporation. If you are going to sea for a short time, you can attend audio-visual training and get a temporary certificate. Five certificates refer to the training certificate of safety and life-saving for offshore oil operations, which are as follows: maritime fire fighting, maritime first aid, maritime escape, helicopter underwater escape and lifeboat and raft operation.