The invention relates to a facility for working by means of high-pressure fluid jets at a cryogenic temperature, including one or more pipes (6, 7, 8) for conveying cryogenic fluid up to a mobile tool (4) comprising one or more fluid-dispensing nozzles (11), so as to supply at least one nozzle (11) of said mobile tool (4) with high-pressure cryogenic fluid, and at least one portion of the fluid pipes (6, 7, 8) including insulating means (20, 22, 22’) enabling said pipe portion (6, 7, 8) to be thermally insulated. The insulating means (20) include a chamber (20) arranged around all or part of said at least one pipe or pipeline portion (6, 7, 8) to be insulated, at least one insulating gas source (5), and insulating gas supply means fluidly connecting the insulating gas source (5) to the inside of the chamber (20) so as to supply the latter with insulating gas from the insulating gas source (5) and to form an insulating gas atmosphere within (21) the chamber (20).