I know about as much as you.
Isn’t 78 feet the depth requiring decompression?
My daughter is a certified diver and here is what she said when I asked about the 78 feet, word for word:
“Your diving computer calculates how long you need to decompress based on several factors and even if you need to go back down and at 78 feet you will get the benz bad”.
I don’t have a clue what that means.
Cletus, I just talked to her. She’s certified to 100 feet. She said she has to stop going down at 15 feet to let the pressure in her ears equalize and she has to decompress every 15 feet coming back up from anything deeper than 25 feet.
She said the diving computer tells you when to decompress and for how long. If you have good lungs your time will be shorter.