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The tubes are almost full of water (20 volume % air when the tube is just relaxing and 10 volume % air when it is under tension by squeezing the top end). So it is loosely filled with water. It's designed to take the expansion stretch when the water freezes and expand into ice (Popsicle). To drink it, I had to use my teeth to tear the end of the seal. So it's pretty stout seal. We'll see next week when I take it down to 100' depth.
If it bursts at depth, we would just lose the drinking water. No big deal.