Hyperbaric welding is the term more commonly used interchangeably with dry welding. Dry welding is widely considered by underwater welders to be safer than wet welding. Therefore, most underwater welders prefer this type of welding.
Before the actual dry welding can begin, a chamber must be constructed around the area that needs welding. Once the chamber has fully sealed, it will fill with oxygen and helium to dry everything out. Most of these chambers have room enough for up to three divers at once.