Australian state-owned sub builder hit by more strikes at crucial shipyard

FILE - In this photo provided by U.S. Navy, a submarine departs Joint Base Pearl Harbor-Hickam, Sept. 1, 2021.

Workers at Australian state-owned submarine builder ASC Ltd began a four-day strike on Wednesday, escalating a campaign for higher wages that threatens maintenance work on the aging submarine fleet Australia must rely on until its nuclear-powered AUKUS replacements arrive in the 2030s.