Isolation protocol
The isolation protocol, also known as confinement mode, was the name of a computer protocol on Starfleet ships. Triggered by the computer's detection of a hull breach, emergency bulkheads were closed to isolate sections of a starship. ()

The  encountered a quantum filament that triggered a hull breach and consequently the computer executed this protocol, isolating senior staff in different areas of the ship. Prior to this event, Counselor Deanna Troi was unfamiliar with the protocol. Chief Miles O'Brien explained it to her, as holding the rank of lieutenant commander, she was the senior officer at the time. ()

Security