Mid 90’s, tropical setting, searching for sea snakes

So I saw it on tv in the 90’s (I have no idea if it was made for tv or just an old movie playing on cable). There were a group of people researching or maybe just hunting sea snakes. I remember the girl got her period on the boat. There was a scruffy captain looking dude and some cave sex between him and the girl. I have zero memory of the plot line beyond that it’s been bugging me for years.

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