The park is a landing locale for immigrants arriving from Cuba in homebuilt boats called "chugs". Obtaining and housing the migrants is a specific difficulty for Dry Tortugas, that has constrained resources for such arrivals and and that is many hours from the nearest Coast Guard or Border Patrol models. https://johnnydxnds.bcbloggers.com/27676560/the-smart-trick-of-tortugas-that-nobody-is-discussing