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Now that's cool. Do you have some automated way of testing it or will you be in it on the first test at that depth?

I imagine that the first test pilot will be a computer. Submarines are really nicely simple systems, which is why it is possible for a bunch of amateurs to build one.

that's awesome, how do you plan on waterproofing all the openings?

The port holes will be acrylic windows in a window frame with O-ring seals. The O-ring will be placed on the side facing away from the water such that when the pressure rises on the window, the pressure on the seal rises as well, making it even more water proof. Same idea for the hatch.

Love it !!