Portuguese TDI Diving in Overhead Environments Manual
The Overhead (Cavern and Cave) Manual is the text-book literary assistant to the TDI Overhead (Cavern and Cave) certification course. This manual will serve as your reference tool as you proceed through the various levels of TDI cave training. The TDI cave diving programs have been carefully crafted to teach cave diving specific practices and procedures. Dives incorporating decompression stops, rebreathers, or gases other than air require additional training.