False 1623-B4 CUCC 1976/B4 1623 4 1/S + B4 1623-B4 CUCC 1976 Descent of 45° snow slope reaches a choked rift. Above and ahead water enters via small aven but no sign of a way on. CUCC sketch 1996 ? 1623/b4.htm 1623/b4.htm