Kelway did an Umko with Han van Ardenne, who tells of a high water marathon where they wrapped deep in the valley (near Riverside?).
Han surfaced, the boat didn’t. Then Kelway surfaced with a huge gash in his leg pouring blood. “The bone was showing!”
Han doctored him with a T-shirt-and-duct-tape bandage.
They finished at Goodenough’s.
Kelway went straight on to hospital for many stitches.