for all u guys know Fairyland may just be a terrorist asking us how we would respond to such a situation so that he and his fellow tangos know the countermeasures when they actually take over the fully-laden tanker

for a start i think a "panic button" for oceangoing ships should be made mandatory, like in US-bound airliners. once the crew suspects a terrorist infiltration they could press the panic button, then the nearest navy ship would be activated to escort the hijacked tanker to a safe location.