 If it weren't for the heroic efforts of first responders in Prince George's County, Fairfax County, and D.C. WTOP's Cheyenne Corrine was at the National Harbor and on board one of the Prince George's County police boats involved in the rescue. Around 11 p.m. last night, a boat on the Potomac River with seven people on board hit an unlit buoy. The vessel had crashed and was taking on water. The situation quickly turned into a double rescue when another boat with two adults and two kids tried to help.