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1.7 3632 I loaded an earlier save to restart and it's still flooded:
Build: 1.7.3622 Mode: SP Mode: Survival I'm doing the story (Radar Station) in 1.7 III vanilla and the basement is flooded almost up to the ceiling!
With the jetpack disabled you can't get through the force field across the elevator of the pirate base.
I just started a new 1.7 experimental game and the survival tool defense mode and the shotgun are doing zero damage.