Flash flooding in the area round the Yorkshire Three Peaks caused problems for rescuers trying to reach an injured caver.
The man fell while underground at Ribblehead yesterday, and was knocked out.
The Clapham-based Cave Rescue Organisation was called out to the incident about 6.20pm, but a cloudburst around the west of Ingleborough led to flooded roads.
A CRO spokesperson said: “The caver recovered sufficiently to make his way across the fell with help from his party and was transported by ambulance to hospital. Due to the severity of the weather and significant flooding, CRO escorted the ambulance back to Ingleton.”
The flood also meant the team had to change its plans for training that evening as White Scar Cave, the venue for a casualty evacuation exercise, was severely flooded, with torrents of water pouring from the entrance of the show cave.