The Battle Bridge is located on Deck 18. The Battle Bridge duplicates all of the functions and operations of the Main Bridge. the only difference is that the Battle bridge only comes into direct operation of the ship upon the disabling or destruction of the Main Bridge. The Battle bridge is manned with a skeleton crew permanently (to ensure the operational status of the controls). The crew go onto standby when the ship is put into Yellow Alert status. When the ship goes into Red Alert status then the Battle Bridge is put to full operational readiness to go online at a split second notice. Entrance to the Battle Bridge is highly restricted to computer code access. If the Federation ever goes to a condition of war then the Battle Bridge becomes the tactical heart of the ship with a permenant standby status and the option to swap operations from the more vulnerable Main Bridge to the Battle Bridge at a moment's notice.