This is nonsenseYeah it would be really dangerous to do it without an argon bottle. I know people who’ve tried it and they sank with their feet floating upwards, so they had to let out the air through the wrist seals and could then go back up.
They said it was scary... I can imagine. I definitely wouldn’t go freediving in a Drysuit. It’s just not practical in any way shape or form. You would have lots of drag and be extremely slow, it wouldn’t be as warm as a wetsuit is and the suit squeeze and no redundant air source are problems that CANNOT be overlooked.
If you sink in a Drysuit it can be hard to let the air out sometimes....