- Submarines historically spent most time on the surface, submerging only for attacks.
- Nuclear power allowed indefinite underwater operation, changing submarine design and capabilities.
- Operation Sandblast in 1960, led by USS Triton, demonstrated the first fully submerged circumnavigation of the globe.
- Nuclear submarines became faster, quieter, and more hydrodynamic with tuna-like hulls.
- USS Triton served briefly (11 years) before decommissioning, with its sail preserved in Benton, Washington.