That was cool! I think the red corridor could've had something happen in the middle, to make the swimming more compelling. I found the story interesting and I liked the combination of modern technology & Egyptian tombs. Nice work! I did encounter a bug where I couldn't seem to fit the valve in the socket, then I died and it worked fine the second time.
[SPOILERS BELOW]
Is the story inspired by an already existing SCP? Or is it entirely original?