I do not believe the PH boat is replacing the Aggressor. I believe the PH boat is "in addition to".
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Simon - with all due respect, people take what is said on this board very seriously. I have been to Cocos several times since 2007 and the waters there are not "Tiger Shark infested". I swim a lot when I am at Cocos. Perhaps this is your British humor but some people will take this seriously.