From 1993 to 2017, the Navy conducted 117 maintenance overhauls of attack submarines and sent 29 to private shipyards. Overhauls conducted at private shipyards were 31 percent less expensive, on average, a gap that has narrowed recently.
CBO
2019-04-22
<a rel="nofollow" class="external free" href="https://www.cbo.gov/publication/55032">https://www.cbo.gov/publication/55032</a>