| Name | Age | Sex | Injuries | Injured areas |
|---|---|---|---|---|
| Traina, Carl | Not recorded | Male | Not recorded | Not recorded |
Members of the Boston Grotto had explored Schoolhouse Cave the previous day but had left their ropes in place. A group of five cavers entered at 5:30 a.m. to rerig the cave. Around 12:30 p.m. Warren Heller had completed Leo's Climb near the Judgement Seat and had gotten off rope, when the ledge he was standing on gave way. He immediately called, "Rock!" and was able to arrest his sliding fall in about 10 feet. The three cavers below Heller at the top of a 100-foot drop were able to dodge the rock. Carl Traina at the bottom of the pit was unable to completely get out of the way of the rocks. A 75-pound, rectangular rock struck him a glancing blow just below the small of his back. The victim was fully conscious, coherent, and not bleeding externally but in considerable pain. A member of a second party which had just entered the cave was sent for help. Twenty-five people, mainly from the Boston and Philadelphia Grottos and the Potomac Speleological Club, were able to get the victim out by 7:30 p.m. This involved raising him in a Stokes litter up three pitches. Traina suffered fractures of the lower sternum and hip ball joint and was expected to be hospitalized about one month.
Analysis: Heller misjudged the condition of the ledge. Possibly more thought about the danger of rock falls by those at both the top and bottom of the pit could have prevented this accident. The rescue was very efficient because of the large number of highly qualified cavers in the area at the time.