Koh Tao, Thailand: Bull Man vs Bull Shark

You never really know what to expect when people are expecting sharks. Folk get excited about your usual reef sharks, but they are generally pretty shy and harmless, and much less bulky than a man.

However, at 25m down at a deep-dive pinnacle with about 8m visibility things can feel a bit different. Plus, these specific sharks, bull sharks, fully the size of an American prop forward and five times as fast, have been known to have a bite at a calf muscle or two.

Kind of sobering, even if they didn't seem to be paying much attention to the humans with the silver tubes on their backs.