The lowest deck on the vessel contains torpedo tubes and the vessel's Faster-Than-Light (FTL) engines.

The ventral conning tower is accessible via a hatch from this deck.

The secondary spaces of this deck are not accessible via the forward stairwell. If these spaces become isolated from the primary spaces (the citadel) then escape hatches can be used to access deck 6.

Torpedo Tubes

Torpedo tubes three and four are located in the forward half of this deck.

The firewall is set back further than other decks to that it is behind the tubes.

Workshops

Three workshops supported by an engineering store are located in the central sections of this deck. 

These workshops provide both mission flexibility and resilience, allowing the repair and fabrication of parts and equipment or even the creation of completely new equipment to meet unexpected mission requirements.

Workshop One

The largest of the workshops is equipped for the repair and fabrication of structural components for the vessel and key systems.

Workshop Two

Workshop two is configured for repair and fabrication of heavy duty electrical systems (eg environmental, weapons, sensors, etc).

Workshop Three

Workshop three is configured for the repair and maintenance of computer and data equipment.

Engineering

FTL Engine

The FTL field generator and field amplifiers/projectors are located within the citadel.

Generators/Batteries

Emergency power generators and high-output batteries are located in the aft sections of the citadel.

Impulse Coil Capacitors

Capacitors to regulate the output of power the the impulse engine plasma acceleration coils are located aft.

Deflector Field Generators

Deflector field generators are located in the port and starboard FTL equipment areas, powering deflector arrays on the radiator fins, lower superstructure and amidships.

The generators are configured as a redundant pair and can also be used to supply forward deflector arrays if those generators fail.

Ventral Conning Tower

The ventral conning tower has a number of sub-levels providing access to different types of equipment that require the wider line-of-sight offered by the towers.

Access is via a hatch in front of the cargo lift's aft door (the lift's door is automatically disabled when the hatch is in use). A spiral staircase provides access to lower sub-levels, with each sub-level separated by a hatch.

Utlility Mezzanine

The utility mezzanine level is the only sub-level in the conning tower that is routinely pressurised.

This level contains the PDN nodes for equipment on lower levels and the capacitors that support the firing of the Close-in Weapons Systems.

Drone Ops

Two sub-levels provide drone launch and recovery using fully-automated processes.

Up to eight drones are routinely hangared in this area. Replacement drones can be flown in from storage on the flight deck.

Sensors

Sensor equipment that is part of the main passive and active sensor systems are located on this sub-level.

Additional sensor and communications equipment to support drone operations is also located on this sub-level.

CIWS

Four CIWS beam weapon systems are located on this level, taking advantage of the conning tower's increased line-of-sight to destroy incoming kinetic weapons, drones or fighters.

The CIWS systems rotate around a central rail allowing them to target multiple vectors or to compensate when one system becomes inoperable.

The dome at the bottom of the conning tower contains the fire control sensors for the CIWS system.