I’ve seen an interesting document (PDF) of the scientific discussed topics in the Blue 2005, the International Conference on breath-hold diving (December 1 - 4, 2005 Pisa, Italy).
Link:
http://www.blue2005.ifc.cnr.it/
(the PDF is down on the left)
Link:
http://www.blue2005.ifc.cnr.it/
(the PDF is down on the left)