A fluid activated automatic release apparatus is configured to release a pressurized gas from a cylinder bottle and/or activating various mechanical release mechanisms. The apparatus may include a liquid sensor component moveably coupled to a cam member; and a piercing pin configured to engage a fluid container, responsive to rotatable movement of the cam member. The apparatus may include a liquid sensor component moveably coupled to a cam member; and a barrel device biased to move linearly responsive to rotatable movement of the cam member.