Will you manage to get out of Army Exposition Escape?

Author Comments:

You have always been curious and this time your curiosity leads you to visit a special exhibition on the theme of the army. What is special about this event is the tank that will be exposed exclusively. Because you are to curious, you decide to go inside the tank and the only access to the tank closes and locks as you enter. You just can't stay inside the tank without eating or drinking and especially not knowing who will think to look inside. So you must find anything that might be useful for you to get out of this unusual situation.