ticokitty:
Can someone clarify why it is more dangerous to dive quarries? Is it loose rock or bad viz? I never have. I don't like the cold.
Cold water is probably the biggest danger (most quarries are 37F at the bottom year round). But there are a lot of things in my opinion that contribute to the reason there are so many accidents at quarries. Rarely is there a single cause for a fatality.... typically they are the result of many little things that snowball. Also it seems to me (no data to back it up) most of the quarry deaths seem to happen early in the season (April, May and June)
1) Regulator issues- you have a lot of students going to quarries to get certified BOW or beyond. Some (not all, so please don't let this start some huge arguement) are going to the quarry for their cert for the sole fact it is cheaper. Some (again not all) let $$ make a lot of their diving decissions and buy the cheapest gear thay can find- used gear from their neighbor, stuff they got off e-bay, or just cheap gear that wasn't meant for cold water, and more frequently regs they buy off the internet and put together themselves. This gear may not have been properly serviced, might not be properly fitted for the diver, or might just be poor quality in general. At the cold temps in the quarry regs need to be environmentally sealed or they WILL free flow.
2) Improper thermal protection.- temps at most quarries are 37F at the bottom year round. Divers Renting quarry suits that do not fit properly, divers underestimating the cold (why would you need to wear a 7mm wet suit in July???)
3) Trying out new gear- Lots of divers will go "local" to try out a new piece of equipment, or a new gear configuration.
4) First dive of the year, in a while or ever- Skills are rusty, nervousness, anxiety... you got it all.
5) Divers going beyond their training. Divers breaking the depth limits of their certification, "trust me dives", etc are all problems I've seen.
6) Complacency- there are a number of divers who go to their local quarry every weekend, some of these divers get laxed. ("lets hop in and check out the bus " is the extent of some divers dive plans)
7) Task loading- practicing skills or extreme situations- no mask swims, trying to use a lift bag, isolation drills etc. Add that to the previous mentioned problems (imagine having a free flow when you aren't wearing a mask)
Minimize your risk- buy gear appropriate to the environment in which you will be diving. Have your gear serviced regularly, test out new gear in a swimming pool, if you haven't dove for a while consider doing a refresher at a pool. Dive within your training (remember that if you are diving the tables you need to add 10 feet to your depth or go to the next letter group depending on the agency when diving in cold water). Do a pre-dive check before every dive. Plan your dive and dive your plan. And most importantly Stay calm- PANIC KILLS DIVERS!
*Edited typo (add 10 feet for cold... not 110)