predive

“Vessel prep” had been completed at dawn, so after a pre-dive briefing, I climbed a ladder to the top hatch of the sub, took off my boots and clambered into the tube

2019, Tony Perrottet, “A Deep Dive Into the Plans to Take Tourists to the ‘Titanic’”, in Smithsonian Magazine

Each of the divers was tested seven times--twice predive in the chamber, three times during the dive, and twice postdive, with one to several days separating the administrations.

1981, Helen M. Paulson, Alma P. Ryan, The F-M 100-Hue Test For Assessing the Effect of Oxygen on Color Vision, U.S. Naval Submarine Medical Research Laboratory, page 3