The US Navy’s shipyard overhaul is going to cost billions more and take decades longer than planned, watchdog warns

The US Navy’s plan to repair its public shipyards is expected to cost billions more and take decades longer than originally planned, according to a new government watchdog report.

The Shipyard Infrastructure Optimization Program is intended to fix poor conditions at the Navy’s four public shipyards, which maintain the fleet’s nuclear-powered submarines and aircraft carriers.

However, unplanned costs and newly identified risks have dramatically expanded the project’s scope, leading the report authors to recommend that Congress require the Navy to provide annual updates on its progress.

Last week, the Government Accountability Office, a…