The fifteenth issue of Tech Diving Mag is available for download at www.techdivingmag.com

Contents:
* The Body - Descending
* Blueprint for DCI
* Line Marking Systems In Use Around The World - Part II
* Calculating the acceleration in post-diving no-fly time associated with breathing surface oxygen
* Diving Pioneers & Innovators: A Series of In Depth Interviews (Chuck Nicklin)