night fishing -long line story

We are ready, full of enthusiasm, we have prepared a long-line with 50 hooks. We have another two hours until sunset. As we drive up to the position for the long-line, preparing the bait and bait the line. Sunny beautiful day, rosy sunset gives a hint that the night will be bright and warm. End of summer, tourists and weekend drivers with fast boats(who can not behave at sea, so-called kamikaze) left us. We are alone at sea, beautiful, thick. Here's the plan: we're going to set trawl lines to a depth of about 30 meters (98 feet), since it throw in a  position where we have not fished before, we will illuminate it with glow sticks and type the position of the GPS on our mobile phone, and while long-line is in the sea, we will fish from hands of 50-odd yards away. Long line got bait on the all 50 hooks and is ready for installation. The first flag is in the sea, a few minutes later and another. That's it, long-line gear is in the sea, and will remain so for about 2 hours. We anchoring little further and begin fishing.
Every now and then we look toward the flag, well everything is fine. It's getting dark and we still see the light of  flag long line. A little strange, as many falling darkness to see less the light, and after a while it can not longer see, but we know it's there somewhere. It is good, we caught about 2 kg (4.4 pounds) of fish. Let's boot lines and go for a few hours to fish on our hot spot, and let's go home. Raise anchor, but something is wrong, the anchor is not holding, so current move us little by little from our position. Well I guess we are not too moved (not at all). Where is the long line? Where are the flags of the long line? We started toward him, but where is it? I don't see the light, obviously current was moved us much further than we tough. Never mind we have information on the GPS. But we've never used a GPS, so let's try. We keep going right and left, up and down, but nowhere long line. A little further away from us, some fishing boat all the time going from left to right, and little by little gets on my nerves. Whether they may have found our long-line, while waiting us to, so they can pick him up? Running out of fuel, and the battery on the phone is running low. But I can think of go and come tomorrow morning when i can see flags of long line. When after an hour and a half a red light from a flag, just suddenly emerged from the darkness. What a relief, what a joy. We climb on long line gear and let's go home. Several conger and sea bream is not cheer us up. Too much is invested: effort, fuel and bait, for so bad catch.
This position is our suggested by a friend, and it really necessary to say that we never went to that position again.