I just started a thread on this a few days ago on the Baidarka mailing list. Got the book on Saturday and found a large video rental store that had the Tim Severin documentary EPIC VOYAGES OF HISTORY BRENDAN VOYAGE, put out by Films For the Humnities and Sciences. Great book (going back to reading it now) and cool film.

Best part of the film is where the boat is punctured by a large chunk of ice. One guy is shown hanging over the side stitching on a patch with hands immersed in icy water, with someone on the inside passing the needle back out. They state that if this had been a wooden or fiberglass boat they would have been sunk. They also mention that an ice cutter ship had sunk a few days earlier.

Tim Severin has a site on his books at

http://www.timseverin.net/

: You leather boatworkers would do well to read the brendan voyage by Tim
: Severan. It is the account of an irishman's attempt to retrace the 6 th
: century wanderings of St Brendan in his leather curraugh.