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I have been diving for 40 years with diabetes type 1. It can be a challenge to keep my glucose levels steady on multiple dives and/or long swim beach dives. I try and keep my sugar levels a bit higher before and during dives. I wear a pump and just disconnect before dives and do a quick glucose level. If it is lower than 200 I will eat a power bar or something similar. I have come up pretty low before and did not notice it underwater. Between dives I hook up my pump and eat lunch or a snack with a smaller than usual bolus and try to drink lots of fluids. After the dives glucose levels seem to shoot up due to not having insulin for a few hours so I try to take a bit extra after all the dives are done. I don't take glucose with me but I should. Last weekend I did my biggest bonehead move and on my second dive went down with my pump on. I can say that medtronic pumps do not like 145 feet of water. That was the first time I have ever done that and hopefully the last. My pump was out of warranty but I did have an old pump to use till I go through all the loops and money to get a new one. I do a lot of fairly deep freshwater dives to 160-170ft and could never tell weather I was low or just have way too much nitrogen in my brain. Usually it is the nitrogen but I have come up with glucose in the 50's. I guess the moral of the story is dive with less insulin, eat plenty and remember to take off your pump.