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The pressure at the depth of 100m is: $$p=\rho*h=100*1024=102400kg/m^2=10.24atm$$ Assuming 1 atm pressure inside the cabine. As per Roark’s Formulas for Stress and Strain WARREN C. YOUNG RICHARD G. BUDYNAS Seventh Ed. pp 502 ch. 11 table 11.4, for a square plate with free edge supports. $\beta=0.2874 \ for\ square$ $q=pressure, \ p$ \$t=thickness,\ \alpha= ...