If an alien had evolved on a planet with 10 times Earth’s gravity, how far into Earth’s Ocean could they…

Let’s assume that this hypothetical alien crawled out of the identical primordial ooze to the point where they share significant genetic similarity with humans, and due to either evolution or outside intervention, evolved to be similar physiologically to humans if not in appearance. They have stronger muscles/bones, better lungs and circulatory system, etc. How far could they dive into our ocean before they couldn’t withstand the pressure?

Assume that evolving on their home planet gave them efficient enough lungs that Oxygen/Nitrogen toxicity isn’t an issue.

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