I went on a dive with someone who didn't get his gear checked out and hadn't dove for awhile. We did a wreck 125' with a 2knot current. We had to pull ourselves down the anchor line. It felt like I was having a water face lift I couldn't turn my head to make sure he was behind me on the line without holding my mask and reg. The current wanted to rip my reg out. I had to bite it hard to keep it in my mouth. We go down to the wreck, no problem. I reached 1000 psi and I signaled to go up. His gauge said over 2000 psi. While swimming back to the line, I thought it was odd that he had more air than me as I usually have more air left than most men. We got to the line, went up a few feet and he signaled out of air. I immediately gave him my reg and used my integrated, praying it would work. It did. He tried to buddy breath with me and I signaled no, I had mine. We had to go back up the line. It wasn't fun. Within a few feet of the surface my integrated reg filled with water as I tried to breathe from it. I swallowed the sea water as I did get air first before it filled up and I didn't want to spit it out and have no air. I shot up the last few feet dragging him with me. Thank God he didn't let go of the line as the current was strong and he didn't have a safety sausage.
When I had my integrated checked out, (only 8 months old), it seems the water pressure flipped a valve.
It all turned out all right, but it would have been scary to try and buddy breathe, hold on to the line and get to the top from 90 plus feet down.