was out on the day in question and heard the entire incident on the radio.
Incident was most likely caused by interaction between both vessels. a common cause of incidents between 2 vessels running alongside each other. Vessels are basically sucked into each other and there isn't a great deal you can do about it once it has caught you. Over the years quite a few tugs and pilot boats have been sunk or damaged by this.
Having done lots of crew transfers with both grey funnel and commercial vessels, going up along side a large vessel while underway is very risky and in any sea can be bloody scary. luckily on this occasion nobody was killed and all were recovered very quickly. From what I heard all 5 were out of the water within 5 minutes and that included the FPV launching their second sea boat.
I went alongside the carrier, I survived and didnt even get shot at!!!