LIST OF SYMBOLS 



A Exterior surface area, cu ft 



D; Inner diameter of concrete sphere, in. 



Dp Outer diameter of concrete sphere, in. 



f^ Uniaxial compressive strength of concrete, psi 



h Depth (or pressure head), ft 



K^ Permeability coefficient, ft/sec 



^im Short-term implosion pressure, psi 



Pj Sustained pressure, psi 



Q Total quantity of seawater intake, cu ft 



Qp Quantity of seawater permeating wall of sphere, cu ft 



T Time, sec, hr, days 



t Wall thickness, ft, in. 



Wq Weight of concrete sphere, lb 



Wp Weight of displaced seawater, lb 



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