In the UK, cave diving was an additional skill learned by cavers to explore flooded parts of a cave system, rather than divers choosing to explore caves. The early equipment was little more than cylinders fitted with belt loops and slid onto the standard caver's belay or battery belt along with any extra weights needed to achieve neutral buoyancy, and a caver's belt mounted battery pack. This simple sidemount configuration was particularly low profile and suited to small cylinders, and worked well for low visibility, usually fairly shallow dives, which were often more of a crawl or wriggle though tight confines than a swim.