I put a few of these graphs up in a few other people's threads but here's a compilation with commentary and more polished graphs in my blog post:
https://www.socalspearit.com/single...ection-of-10-Heart-Rate-Graphs-of-Ocean-Dives
Example:
https://www.socalspearit.com/single...ection-of-10-Heart-Rate-Graphs-of-Ocean-Dives
Example: