This question is harder than it seems. The dive that I logged as #50 was really an extension of dive #49. The occasion was a liveaboard trip out of San Diego, on which I was using my brand-new OS Systems "Dolphin" drysuit; the location was somewhere off San Clemente Island, due south of Catalina. On the first dive, I made an abortive 12-minute plunge to 58', where my buddy's regulator free-flowed. We surfaced, I ditched him for another buddy with functioning gear, and my new buddy and I descended for a 31-minute dive to 54'.
*sigh* I wish I had more data and could describe the dive better (kelp or rock bottom? fish? viz?), but my logbook on this trip is woefully incomplete. About all that I recall from that trip is being agog over the trip organizer's daughter. Ehrmagerd, ehrmagerd, ehrmagerd...