We were new to our boat, a GB36, which we had purchased two weeks before. We were going from Pearl Harbor to Kaneohe. We anchored on a small shelf off of Hanauma Bay, just outside of the Marine Preserve. 20' of water, short scope, rocks to the North. 30 feet of chain and 5/8" woven rode. Just getting dark. 6 of us went into the water for some fish, just outside of the Preserve. I finished up, found the anchor, followed chain to anchor line, followed until I find a frayed end of anchor line . . . Now I'M FRAYED! Wife was on board with our 4 kids. Neighbor on board with his 3 kids.
Anyway, I surfaced, first looked to the rocks for boat/debris . . . nothing, then turned and looked offshore . . . There she was, about 1/4 mile off shore! I kid her and say she was TWO Miles, but really about 1/4 mile. I waved my light back and forth, started swimming toward boat, she came and picked me up. Then we went in and picked up the rest of the divers. She had been on the stern of the boat, heard loud noise from the bow, she went forward, didn't see anything, turned around, and then realized "She didn't see anything!" The anchor line was no longer going out over the bow! It had broken. I had just run her through engine starting etc, a few days prior . . . She had never handled the boat before. She started it up and did exactly the smartest thing, get away from land! Anyway, the line looked just fine, but apparently, age unknown, it was compromised. That was the last time I've ever trusted an anchor line from the PO. Went out next week and bought 90' of 3/8" chain and 240 feet of 3/4" line to replace old anchor line!