At last year’s RF4, Dr. David Doolette dropped a few remarks about how Bühlmann with gradient factors might not be the be-all and end-all of decompression models when it comes to very deep and long technical and cave dives. He encouraged divers to look into the US Navy’s Thalmann algorithm.

Here’s my piece for GUE’s InDepth magazine explaining what this is all about – an interesting variation on traditional Haldanean models that has been around since the 1980s, more or less ignored by the civilian dive community. Buckle up for some theory!