Liquid immersion tank

A liquid immersion tank to store a coolant, the liquid immersion tank comprising:

• an outer case configured to have a first hole in a side wall of the outer case and an opening at a top of the outer case;
• an inner case configured to have a second hole in a side wall of the inner case and an opening at a top of the inner case, the inner case being contained in the outer case and containing an electronic device to be cooled by the coolant;
• and
• a spring configured to:
• support the inner case to be able to move between a first position and a second position disposed above the first position,
• cause, when the inner case is at the first position, the second hole to communicate with the first hole so that the coolant flows into the inner case, and
• cause, when the inner case is at the second position, the second hole to face the side wall of the outer case so that the coolant is prevented to flow into the inner case,
• wherein, when the inner case is at the second position, a part of the inner case projects upward relative to a specified position of a liquid level of the coolant.