Removing Bloom Biofilm is one of many environmental hazards you'll have to deal with in Subnautica 2. This tough, web-like organic gunk seemingly enjoys blocking doorways to various colony ruins, which is especially annoying when you're hoping to get inside so you can scan and steal everything in sight.
Two of the ruins I accessed by clearing the film also contained some really fun posters that I immediately scanned and put up in my base, so keep your eyes peeled for those.
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