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This looks here like we've got a very small brine pool.

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These are highly dense, highly saline waters.

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You have a very high degree of dissolved salt in this water,

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and so it's much denser than the overlying seawater and it seeks low spots and so you see pools and sometimes we see rivers of moving brine.

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I think we're moving up an extinct, what could be a relic brine waterfall here,

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where I think that brine fluid moved down slope.

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We can now see pretty clearly the shimmering created by the density contrast in the water of that fluid coming out of the seafloor.

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It has been a truly spectacular dive today.

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To quote Bill Shedd's email, it's days like these, you can't believe you get paid to do this sort of thing.