Magnetic storage bay
A magnetic storage bay was a containment device for unstable materials by holding then together or keeping them apart in order to prevent a negative reaction.

It was generally considered to be the safest part of the ship and was usually used by the crew during emergencies as a temporary shelter from toxic gases and or lethal pressure. It had a separate ventilation system from the rest of the ship. It was used to move heavy objects from their storage positions in order to make them easier to transport.

Unfortunately, in 2370, it was unable to shield the crew of the  from subspace beings that resulted in the death of all seven crewmen. ()
Spacecraft sections