Is it true that shipping companies recruit seafarers and require physical examination and seafarers' certificates?

Really. According to the provisions of the International Seafarers' Labor Convention, all personnel engaged in maritime occupations such as sailing, fishing and offshore oil and gas exploration must have corresponding seafarers' certificates and pass relevant medical examination standards. Seamen's certificates usually include different levels of professional qualification certificates such as crew, captain and chief engineer. Physical examination needs to check all physical indicators to ensure that the crew can adapt to the environment and pressure of long-term work at sea.