(1) Large titanium spheres capable of holding 4 ICBMs bath plug like hatches biased to float upright.
(2) Minimum thickness to resist shear punch thru
(3) Basic Equ:
4/3.pi.R3.density of water - 4.p.iR2.thickness of titanium.density of titanium - weight of missiles = slightly positive force.
(4) Start with very small sphere at ocean floor Main stress equ:
2.pi.R2.pressure of water at this depth < 2.pi.R.Thickness of titanium.Max compression strengh ( non yield) per unit area.
The spere is now expanded with all dimensions pro rata until (3) holds.
(5) Aditional spheres house: living quarters, reactor combined with gen, thin skinned ( at ocean pressure ) propulsion unit - no weep at shaft. The drive from gen via insulated cables buried in sphere to similar at prop unit.
(7)All com the bathplugsbined string of pearls form by 4 stringers. Top stringer over Icbm spheres can be blown to release spheres to surface where compressed gas will launch missiles.
(8) All surrounded by plating to hold oil and lead ballast. By discharging alt the sub can rise anf fall.
(9) Problem; necessary to set giros and arm missles before launch. Solution corridor throuhout 'string' pressure of water will press flanges on spheres together. So that the spheres can be sealed before launch the bathplugs can be stored in intermediate smaller spheres ( diam > than max diam of plugs. )
(10) Alternative: gen output can be run into external heaters which can at >600 supply superheated steam in inulated chamber to lift vessel, using a ram jet type vains ( uni direc ) water can enter achamber be heated to steam, when pressure exceeds agiven amount gas escapes thru preloaded vains. Thrust on vessel. Heaters switched off ' bubble of steam collapses water enters thru input vains. Heaters protected from corrosion by continuously replacable sheath.