On October 11, 2000, at 1915 eastern daylight time, a Cessna 172K, N7396G, collided with a ditch beyond the runway threshold after landing at the Indiantown Airport in Indiantown, Florida. The airplane was operated by the pilot under the provisions of Title 14 CFR Part 91 with no flight plan filed. Visual meteorological conditions prevailed at the time of the accident. The certified flight instructor and dual student were not injured and the airplane sustained substantial damage. The flight originated from Fort Lauderdale Executive Airport, Fort Lauderdale, Florida, at 1815. According to the pilot, upon landing on the dry grass/turf runway 13, despite attempts to stop, the airplane continued to roll past the runway threshold, approaching a ditch abeam the runway. Right rudder was applied unsuccessfully to avoid the ditch, and the airplane ran off the end of the runway into the ditch and nosed over. Weather in the area at the time of the accident was reported to be winds from 040 at 14 knots, gusting to 19. Examination of the wreckage revealed no faults or failures associated with the airplane's braking system. Tire marks were found near the end of the runway where the airplane had touched down. The tire marks continued off the end of the grass runway into the ditch where the airplane nosed over. No mechanical problems were discovered during the examination of the airplane.