Subs

During the second alien war, X-COM made use of amphibious flying ships that were capable of intercepting enemy ships and transporting troops around the world. These flying-subs are as quick and versatile as the ships used in the first alien war, but can also operate underwater.

Due to various reasons, X-COM flying-subs are forbidden from engaging enemy ships in air-to-air combat while flying over dry land.

Grouping by role

Interception Submarines

• Barracuda -- your first combat sub.
• Manta -- first hybrid craft.
• Hammerhead -- hybrid fighter/transporter craft, thought it doesn't excel in either roles.
• Leviathan -- the best craft in the game.

Troop Transporters

• Triton -- your first transporter.
• Hammerhead
• Leviathan

Grouping by availability

Starting subs

• Barracuda
• Triton

Researched subs

• Manta
• Hammerhead
• Leviathan

Glitch Subs

• Ammunition A.K.A Transformer

Quick Comparision Table

Craft	Max Speed	Range (nm)	Acceleration	Fuel Capacity	Weapon Pods	Damage Capacity	Cargo Space	SWS Capacity	Cost/Rent ($)
Triton	790	?	2	1,400	None	160	14	3	500,000*
Hammerhead	4,030	?	9	60	1	960	12	None	400,000**
Leviathan	5,800	?	9	50	2	1,250	26	4	900,000**
Barracuda	2,400	?	3	800	2	120	None	None	600,000*
Manta	4,600	?	10	30	2	400	None	None	600,000**

* This cost is paid upon ordering, and also at midnight on the first of every month once delivered as a craft rental fee.
** These craft also require a number of Aqua Plastics, Magnetic Navigations and Ion-Beam Accelerators to build as well as this price, and take a substantial time to manufacture. See the table below:

Manufacturing Requirements

Submarine      Hammerhead  Manta   Leviathan
Start Cost     400K        600K    900K
Tech Hrs       14000       18000   34000
Workspace      30          34      36
Aqua Plastics  65          85      120
IBA            1           1       2
MN             1           1       1