Device for difficult intervention in a closed enclosure, including a duct, a first end of which is intended to penetrate within the chamber, the duct being furthermore connected:to a pressure reduction device, the function of which is to lower the pressure within the enclosure；to an outlet duct for extracting the sucked-up material； andto a duct connected to a device for suddenly relieving the pressure and to an opening in the device for bringing the end of the duct into contact with the external air when the pressure within the enclosure reaches a value below a certain threshold.
