Changes

This level occurs when the starship is on Yellow Alert. There is no obvious change in ship's routine, though one Security Officer may be stationed on the bridge. All Security Officers are issued phasers from the ship's armory. Sidearms are locked on default to stun. All other departments maintain normal shift rotations and assignments (except where ordered).

The level always occurs when the starship is on Red Alert. One or two Security Officers are stationed on the bridge, and one to four Security Officers take up stand-by positions on each non-engineering deck. Fully equipped detachments of four or more Security Officers each may be sent to the transporter rooms and hangar bays. All personnel/departments are held in their current shift with all crew maintaining duty locations until the situation has been resolved (or duty shift is relieved). All off duty personnel are instructed to maintain duty readiness and, if not in a designated shelter area, ordered to remain in (or return to) their quarters.

This level is most often used during an Intruder Alert. Pairs of armed Security Officers patrol every corridor on every deck. Two Security Officers are stationed on the bridge, and the Chief of Security routinely checks corridors via audio-visual and/or infrared sensor monitors. If the ship is so equipped, its Automatic Bridge Defense System is activated. Phaser sidearms are locked on default to heavy stun. All on-duty personnel are armed and on-duty personnel, regardless of department, are held in active rotation (regardless of time in duty cycle), unless otherwise ordered. All security personnel are placed on active duty. Non-essential and off duty non-security personnel are confined to quarters.

This level and above are reserved for major boarding attacks or hijackings. Pairs of armed Security Officers wearing Security armor patrol every corridor on every deck. Security Officers are dispatched to guard sensitive areas, including the bridge, auxiliary bridge, engineering, hangar bay, and life support. The hangar bay doors are usually locked shut, and some security bulkheads may be closed, isolating selected areas of the ship. Phaser sidearms may be set to killas default. All personnel are armed and, regardless of department, are held in active rotation (regardless of time in duty cycle), unless otherwise ordered. All security personnel are placed on active duty. Non-essential and off duty non-security personnel are confined to quarters or ordered to evacuation points.

All turbolifts are shut down, and all security bulkheads and hangar bay doors are closed. Security Officers are issued personal breathing apparatus, and some or all decks may be flooded with neural gas, a powerful, fast-acting tranquilizer. All personnel are armed and placed on active duty.

Vents from the engineering fusion chambers are opened, releasing fatal quantities of radioactive gas throughout most decks of the ship. Total crew casualties may run as high as 70 percent.All personnel are armed and placed on active duty.