The suggestion that divers make their deepest dives first may be good advice for new divers. The reduced no decompression time on a deeper second dive increases the likelihood of unintentional entry into decompression. Accidental entry into decompression is extremely dangerous for an untrained and inexperienced diver. Such a diver may have no idea how to safely return to the surface, may not have the buoyancy control necessary to make the required decompression stop, and may not have a sufficient reserve of gas to make the stop.

Proper dive planning and frequent monitoring of instruments reduce the risk of accidental entry into decompression. Recreational deep diving training provides instruction on safe return to the surface after accidental entry into decompression. More experienced divers are more likely to have the buoyancy control necessary to make the required decompression stop. Better trained divers are more likely to be caring a redundant gas source to protect against an out of gas situation or a gas delivery system failure.

With respect to any physiological risk of reverse profile diving, I’m satisfied with the safety factor provided by diving conservatively within the no decompression limits as calculated by my dive computer. The computer is specifically designed for multilevel repetitive diving and correctly calculates theoretical nitrogen loading regardless of the sequence of dives and surface intervals.

Also you went deeper on your second dive, you could have died.