Re:New York to London in an hour - by train
by anamax on Wednesday June 13, 2012 @02:32AM
(#4104615)
> a glass enclosed under sea walkway 30m down is not that much harder than building one 20m down
It's 50% harder.
What pressure are the passengers exposed to?
I ask because 1 hour @ 4 atmospheres of 80% N2/20% O2 is risking decompression illness. (Yes, 4 - you've got 1 atmosphere at sea level.) You can reduce that risk by increasing the O2 percentage but if you do that too much, you're risking O2 toxicity.
It's 50% harder.
What pressure are the passengers exposed to?
I ask because 1 hour @ 4 atmospheres of 80% N2/20% O2 is risking decompression illness. (Yes, 4 - you've got 1 atmosphere at sea level.) You can reduce that risk by increasing the O2 percentage but if you do that too much, you're risking O2 toxicity.