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I expect that you recall/include, for example, the strange, localized red algae bloom we observed on Epstein's "LSJI" (aka, "Pedophile Island")...
Best assessment to date is that it was related to underwater outflow of diesel exhaust and/or humidity-condensate water dumped from the infamous tunnel system. i.e. from the "rape/sacrifice rooms" where, reportedly, unspeakable evil Satanic rites were performed on children...
Looks like sargasso to me...
I’ve seen images like the one at the links below but on Youtube. There are reasons given (ink spill, pollution) but I don’t remember the sheer volume of “ink spills
“ and “pollution” that I’ve seen over the past two years.
https://imgur.com/gallery/VScj3tF
https://imgur.com/gallery/82RonPk
https://imgur.com/gallery/zRoSBE8
https://imgur.com/gallery/mQsInug