[Major Matt Mason]

XB-1 leverages state-of-the-art technologies to enable efficient supersonic flight including carbon fiber composites

Hopefully these materials will handle flight better than submersion.

[NorthMountain]

Hope is not a plan, Major. Every officer knows that.

Carbon fiber is strong in tension, weak in compression.

When the carbon fiber is containing internal pressure relative to its environment, it is in tension.

When the carbon fiber is resisting external pressure relative to its interior, it is in compression.

Therefore, a carbon fiber aircraft hull is strong. A carbon fiber submarine hull is weak.

[Red Badger]