What does the rod do? - The pressure of the water and the force of the spring in the HRU., What makes the knife cut the rod? - Pressure from the spring and the lever arm., After the knife has cut the rod, what pushes the cover away from the base? - Because it moves out of range of the magnet., What does the magnet do? - It prevents the beacon from switching on when it is inside the cover., When the beacon floats away from the base, why does it switch on automatically? - It fixes the cover to the base.,

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