WASHINGTON — A congressional oversight study has sharply criticized the substantial financial toll of maintaining an immigration detention infrastructure at the Guantánamo Bay naval base, pointing to expenses exceeding $100 million. Despite the massive financial investment, a recent official inspection of the facility revealed that it currently houses zero detainees while remaining staffed by nearly 450 government employees. Lawmakers and fact-finders have raised significant concerns regarding the efficient allocation of federal resources toward the underutilized site.