Gel Sacks

Gel sacks are one of the two raw materials used to fabricate aerogel, which is needed to craft the water filtration machine.

Where to Find Gel Sacks

There are several locations for gel sacs, but one of the earliest locations I found them was in the waters around the mountain island (N/NE of the pod where the rounded cloud is on the horizon).

I highly recommend hitting the gel sacs with your knife to get some seeds so you can easily grow your own in an underwater garden at your base.

Other Resources:

• https://subnautica.fandom.com/wiki/Gel_Sack_(Subnautica)