Two small planes collided over the Everglades Saturday, crashing into the swamp, and authorities said there were no survivors. A Piper aircraft and another unknown aircraft crashed at about 3 p.m., Federal Aviation Administration spokeswoman Kathleen Bergen said. Authorities believe there was only one person on board the Piper, but they had no information yet on the second plane, Bergen said. The area where the planes went down is only accessible by airboat, and the wreckage quickly sunk, said Palm Beach County Fire-Rescue Capt. Don DeLucia. There were no survivors, DeLucia said, although no bodies had yet been recovered.