Hong Kong Government Flying Service (GFS, 飛行服務隊) crew members need to attend the dunker training in Singapore once every 3 years. In the training, it simulates that the helicopter falls into water in different conditions and the crew members are trained how to evacuate from the wreck sunken to the bottom of the sea.
The crew members attempt to escape from the wreck only after the helicopter has sunken and landed steadily at the bottom of the sea. Any premature attempt of escape inevitably jeopardizes the chance of survival.
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