Today was shocking, in a very good way since everything worked out well. My closest dive buddies (we did OW together) and I decided to go dive a local dive site since it was a holiday. The first dive went great-I was the only diver who had ever dove the site before, so I briefed them all before we went, and made clear (or so I thought) hand signals and air consumption limits. The dive went well, everyone came up with plenty of air and they all loved their first glimpse of wall diving. As the site is shallow (the wall's deepest point is 60ish feet) it is good as two of the four of us have very few dives thus far. So, second dive, and I encouraged the other divers to take the lead. We headed out against the current for the long surface swim, and didn't quite get to the recommended drop point. I was a bit concerned, as we were out much further from shore then I was used to...and being stupid (I was trying to really let them lead, I am a lead hog) I said nothing. We began our descent, through zero viz (it clears around 30 feet) and I watched my gauges head past 30, to 40, to 50 (where I figured we would land...) until 85 with no bottom in sight! I immediately halted my decent and hovered for a few minutes, using my light to try and discern my buddies, and per our agreement after a minute headed for the surface, taking it slow and steady. I surfaced after a mid-water safety stop, and waited for my buddies. They never surfaced. When they met up underwater (around 90 feet) they found a ledge ahead of them and swam along the bottom. I saw their bubbles and followed them, and eventually determined they weren't coming up and worried something was wrong, so I descended down to them and gathered them together, checking in with everyone. I was shocked not one of them thought to surface! So, all ended well, and I learned to really trust my instinct, but it was not one of my best days! (although the mid column hover was pretty awesome!). I was disappointed my buddy didn't look for me though-although he led the other two shallow to make sure they didn't have any problems. So, what did I learn? Trust my instincts, know the site, and communication!