Just make it out of carbon fiber. That's what they did with that uncrushable submersible that went to the Titanic.

I'm pretty sure the issue was with 'move fast and break things' and not using carbon fiber.

I think it was on the youtubes I was watching a story about how they built that thing and it was <spoiler alert> not really fit for purpose. I mean, no big surprise in hindsight.

	▲	jjmarr 4 hours ago \| parent [-]
		Carbon fibre has poor compressive strength and good tensile strength. That makes it inherently bad at holding pressure from outside in a submarine and good at holding pressure inside a spaceship or airplane.