You will find the water and sea critters on our offshore wrecks to be very similar to what you find in Florida and (to a large extent) Caribbean waters. The big difference up here is that, because you are so far offshore, you are in unprotected water so the conditions are quite variable and can change from day to day.
Someone mentioned getting a safety sausage which is a good idea. However, don't waste your money on one of those 3 foot ones. For offshore, I'd recommend one that's at least 6' long. I'd also recommend one that is semi-closed so that you can deploy it from depth, if needed. Odds are that if you can't find the anchor line, you aren't far from it if you are still on the wreck. Deploy the sausage from here and it will probably pop up right next to the boat (or at least nearby). The crew on the boat are more likely to see it and can track it if the current pushes it (and you) away from the boat. If you try to do a free ascent from the wreck before deploying a sausage, there's no telling how far from the boat you will end up and they may not see you when you surface. Which brings me to my other recommendation...bring a good reel with at least 150' of line on it.