[TXnMA]

KitJ: "All I can surmise about the algal bloom is that something is coming out those drain pipes that probably isn't ocean water."

~~~~~~~~~~~~~

AHA!!! The power of multiple minds!

aquamarine reminded me that underground spaces are typically several degrees colder than aboveground air ambient temp -- so -- the A/C function for the tunnel/underground room complex may well have been one of heating instead of cooling.

Then, reviewing the drainage issue reminded me that another A/C function is Humidity control. On a semi-tropical island, humidity is a big deal! Which means that large volumes of (essentially) pure, distilled water are removed -- and must be disposed of...

I recognize that seawater in the USVI is already pretty warm -- but, what would a steady flow of (even warmer) fresh water (dehumidifier discharge) into the ocean shallows -- do for algae growth?

ThanQ to all! TXnMA
  

[KitJ]

Tex - also check haffast’s comments on this seaweed/algae
https://www.freerepublic.com/focus/chat/3775325/posts?page=430#430

haff - I wanted to reply earlier, but I haven’t had time to dig and compare coloration and growth, but I think you might be on to something.

Common plant in the Caribbean. Has lots of heavy metals in it like lead. Hard to dispose of.

[MileHi]

...the A/C function for the tunnel/underground room complex may well have been one of heating instead of cooling.

Yes

...another A/C function is Humidity control. On a semi-tropical island, humidity is a big deal!

And yes. I guess I didn't make those points very well.

That could possibly be a source for the plume.