Cooling system for a transportation vehicle arranged to be transported in a low-pressure environment

A transportation vehicle comprising:

• a cooling system,
• the transportation vehicle arranged to be transported in a low-pressure environment in a pipe, and the cooling system comprising:
• a sublimation circuit for transporting a sublimation fluid;
• a first heat exchanger arranged to transfer thermal energy to the sublimation fluid;
• a sublimation unit comprising a fluid inlet and an open channel structure comprising one or more channels, which are in fluid communication with the fluid inlet and with an outer surface of the sublimation unit, said sublimation unit being configured for fluid communication with the low-pressure environment inside the pipe;
• a first flow controller for controlling a flow of the sublimation fluid through the sublimation circuit;
• and
• a container arranged to hold the sublimation fluid and comprising a container outlet connected to the fluid inlet of the sublimation unit to supply sublimation fluid to the sublimation unit.