deeperblue.com

yVLxv TIL Humans reach negative buoyancy at depths of about 50ft/15m where they begin to sink instead of float. Freedivers utilize this by "freefalling", where they stop swimming and allow gravity to pull them deeper.
Y7DEx TIL that the WR for deepest scuba dive (332.35 m set by Ahmed Gabr in 2014) is highly controversial and likely faked, as there are far too many discrepancies in the provided proof for the dive, some of which could easily have killed him had he actually dived to that depth