[Akwesi]

It's been revealed that whoever was on the frigate bridge actually though the oil tanker was a terminal on land (which it had just left). They also thought the people on the radio were on a different ship altogether. This still leaves the question of why they just crashed into the tanker - I guess they didn't expect it to move, on the other hand I wouldn't think a giant tanker (250 m+) moves that fast.