Where the CIC is the brain of a ship, Engineering is the heart.
Withouth it the ship would neither move, nor do anything else.
It is amongst the most secure sections en par with the CIC and the NCS.
The ships powerplant is located here, aswell as its engines.
If the ships powerplant runs too hot, the engineers will engage an Emergency lockdown which will lock down all none-essential ship systems.
Though the heat level of the ship is normally controlled by the CIC, the engineers have higher priority.