One seafarer who was onboard the Jascon 4 anchor-handling tug remains unaccounted for but safety fears have put a stop to the search effort around the unit which has now sunk.
The tug capsized in heavy seas about 15 miles off Escravos, Delta state with 12 crew members onboard on Sunday as it was assisting a tanker.
Miraculously one sailor, the cook, was found
