Hole cutting tool and method

(57) -- the inside of the tank, tank and pipeline who are summary container wall parts (21) and accommodate the danger gas and the liquid of an inflammability, explosiveness, or others, vehicles, a vessel, a production line, or the container wall part (21) in this kind of thing -- 孔開けする -- a tool (1) and a method. A tool (1) has a means (24) to pressurize a cutting medium and to emit this medium through a nozzle (2). The nozzle (2) is arranged in the envelopment cover (5) which has a seal safe exit (10) which discharges a container content. This cover has a touching means (7) versus seal in a container wall part (21) in a 孔開 injury 行わるべき domain. It points to a nozzle (1) towards a container wall part (21), and it is constituted so that a cutting medium may be emitted in the shape of a jet when using it and it may collide by sufficient power to cut this wall part to a container wall part (21).