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I have some more questions, ranging form the seemingly simple to the rather outlandish:
1) Is there a good source that shows the types of flora and fauna the live at different levels on rocks around Sark that are sometimes underwater and sometimes abovewater? I'll take Guernsey or Jersey if that's available.
2) More specifically about the flora living on rocks that are sometimes above the water line: Barnacles. Are your kind sharp enough to draw blood if one either drags ones skin over them or puts ones weight on a bed of them (when above water)?
3) I doubt you've ever encountered a group of people underwater repeatedly pounding a bunch of flint stones the size one one's hand against the bottom of a wooden boat. But if you had, would that pounding have been audible form a distance in the water, or indeed from inside the boat?
4) Now I'm not asking if any of you got in a fist or even a knife fight underwater, but there anything any of you can say for how best one should move to be most effective (both attacking and savoring attacks) in such a circumstance?