Abstract: The disclosure relates to a diving mask comprising a body having a faceplate and a flexible skirt, and a snorkel extending a top portion of the body. The body includes an exhaled air exhaust device that puts the bottom chamber in fluid-flow connection with the air duct of the snorkel. The exhaled air exhaust includes at least a first check valve arranged to allow exhaled air from the bottom chamber to flow towards the air duct of the snorkel during a stage in which the user is breathing out, the first check valve being closed during a stage in which the user is breathing in.

Abstract: Liquid ventilator and methods integrating the concept of total liquid ventilation (TLV) using liquid volumes below functional residual capacity (FRC) of mammal's lungs are disclosed. Beyond the automatization of the whole process, the technology has been up-scaled to confirm that TLV at residual volumes below FRC can provide a safe procedure while enabling the full potential of TLV in a mammal such as humans or adult-sized animals. Such tidal liquid ventilation strongly differs from the previously known TLV approach, opening promising perspectives for a safer clinical translation. Also disclosed are apparatus and method for safe and fast induction of hypothermia during liquid ventilation of a mammal.