Mammalian Dive Response in Action (Part 1): Selection of 10 Heart Rate Graphs of Ocean Dives, Done i

Earlier this year I built a custom heart rate monitor to wear when diving. It's based around a sealed Polar chest strap and a waterproofed Arduino unit with relevant sensors and data logging. Yes, I know such devices do already exist (ironically a few weeks after I finished my device I picked up a Garmin Descent watch), but I wanted something that I could tinker with and which would provide complete detail with no rounding or smoothing of the data. ​ Out of many thousands of drops in the past few months, here is a selection of ten dives in which I wore the monitor, presented with commentary and a graph of HR and depth against time. As always, I have to thank my various safety divers and t

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