There is no need for the power to go out when the base floods. It really depends on things like the power generation source and insulation. The power mechanisms can be better proofed against flooding than the base itself.
Well, vinegar and salt is polish. Maybe the constructor is too handy. Maybe refinement steps can be added before something is suitable for construction. You have to have circuits and wiring constructed before making bigger devices already, sometimes…
Well, why do the foundations have to be removed? Doing explanations can help open up ideas that can work. A wide range of structural integrity/protection from the elements things can be done.
I saw one YouTuber using the stun device to hold one creature in place while another creature attacked it.
Also, there could be a survivor from the other ship, but he's hostile to you.