I just googled Koh Phi Phi Ley Thailand sharks. And going by it, very possible it could have been and shark species. I was there in 2002, and know for a fact, there's many black tip reef sharks. That was in the waters off of, Koh Phi Phi Don, which is in close proximity to Koh Phi Pih Ley. But black tip reef sharks don't get that big, and aren't known to be real aggressive towards humans. However, there are bull sharks in Thai waters and occasionally tiger sharks. Both those species are known for their aggression towards humans.
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