Furthermore , it is well - known that the coastal waters were often infested with sharks , so shark attacks were quite frequent as well .
The working day lasted from dawn till dusk and being underwater , along with bruises , could affect the health of some divers .
It is well - known that the coastal waters were often infested with sharks , so shark attacks were quite frequent as well .
The working day lasted from dawn till dusk and being underwater , along with bruises , could affect the health of some divers .