Reading the pressure under water,

 

adjusting the previous "spinning by ring-gear mechanism",

 

(where the cylinder spins to lock on top of each other)

 

Instead this,

 

Drop down, stack on top of each other, rubber on crevices

(rims) up and down where the cylinders meet,

 

and, automated valve system to lock them together

 

(up and down)

 

no need for cylinder spins.

 

 

 

 

But if the components are too sensitive under that pressure,

and cannot be protected....

 

But I believe it can.

 

 

More so than the ring-gear mechanism.

 

 

It is all mechanical, and size isn't limited.