(I should have used furlongs somewhere, but I could not remember how much is that - 220 yards?)

I'm not sure about a furlong, but by my calculations the pressure increase with depth is approximately
68.364 stone to the square Mesopotamian great cubit, per fathom. This gives a pressure rise on those
windows of about 1169.297 stone each, per fathom, or almost exactly 939241 stone per standard
Imperial Roman mile.

I could go on, but I won't

Patrick.


Opinions expressed in this email may contain up to 42% water by weight, and are mine. All mine.