This has happened before. After USS San Francisco collided with a seamount, her bow section was replaced with that of USS Honolulu, which was being decommission

This has happened before. After USS San Francisco collided with a seamount, her bow section was replaced with that of USS Honolulu, which was being decommissioned.[0] These things make economic sense because nuclear refueling is a capital cost, and navies are loathe to waste a submarine reactor that has a decade or more worth of fuel left. [0]https://en.m.wikipedia.org/wiki/USS_San_Francisco_(SSN-711) https://en.m.wikipedia.org/wiki/USS_San_Francisco_(SSN-711)