the.com/pressure hull
The only wall where losing an argument with physics means instant implosion.
means The rigid, reinforced shell of a submarine or submersible that keeps outside water pressure from crushing the crew compartment inside.
from A straightforward engineering compound: 'pressure,' from Latin pressura (a pressing, squeezing), tracking back to premere, 'to press'; and 'hull,' an old word for the outer body of a ship, possibly related to the husk of a seed or nut — the shell that holds everything in. The phrase itself is a modern (industrial-age) naval coinage, born once submarines needed a name for the specific inner shell built to resist crushing depth, as distinct from the outer, non-structural hull around it.
- shape logic
- spheres and cylinders resist crush better than boxes
- failure mode
- implosion takes milliseconds, faster than nerves can react
- design math
- built to survive crush depth, not just operating depth
- titan lesson
- carbon fiber fatigues under cycling, unlike steel or titanium