Insufficient ballast weight to allow neutral buoyancy at the shallowest decompression stop with nearly empty cylinders is an example of a buoyancy problem that can generally not be corrected by the diver. If an empty cylinder is positively buoyant, the diver may jettison it and allow it to float away, but if the empty cylinders are negatively buoyant, jettisoning them will exacerbate the problem, making the diver even more buoyant. Drysuit and buoyancy compensator blowup can cause runaway ascent, which can usually be managed if corrected immediately. If the initial problem is caused by loss of ballast weights or a reel jam when shooting a DSMB, and the reel is clipped on, the diver may not be able to manage several simultaneously accelerating buoyancy malfunctions. Multiple bladder buoyancy compensators can contain air inadvertently added to the backup bladder, which the diver does not release as it is not supposed to be there in the first place. All of these failures can be either avoided altogether or the risk minimised by configuration choices, procedural methods and correct response to the initial problem.