I think one of the largest collections of data points would have to be OW instructors doing CESAs . . . they have to be done one-on-one with each student, so on the day of that skill, the instructors are doing multiple ascents. To my knowledge, there are few or no reports of instructors developing DCS from the day of CESA skills, although my husband generally feels like crud at the end of that day.
Back when I was working on my midwater buoyancy control, I did a number of dives with multiple ascents, both in and out of classes. Some of those ascents weren't even very well controlled, depending on how task-loaded I was. Although I never developed DCS, I did have one night where we did more than 7 ascents in one dive (all from about 20 - 25 feet) where I almost fell asleep at the wheel driving home. After that night, I limited the number of sawteeth I was willing to do.
Back when I was working on my midwater buoyancy control, I did a number of dives with multiple ascents, both in and out of classes. Some of those ascents weren't even very well controlled, depending on how task-loaded I was. Although I never developed DCS, I did have one night where we did more than 7 ascents in one dive (all from about 20 - 25 feet) where I almost fell asleep at the wheel driving home. After that night, I limited the number of sawteeth I was willing to do.
