Every planet needs a naval base, and if it were only for an Escape flight . You need one slot (building level) for every simultaneously flying fleet. A fleet can consist of any number of units, occupying only one slot of your naval base during its flight. A simultaneous flight with another fleet requires a second slot.
 

Requirements

 
none
 

Construction time

 

Level		Metal	Kryptonite	Spice	Construction time
1		2.000	500	800	00:37:02
2		4.000	1.000	1.600	01:14:04
3		8.000	2.000	3.200	02:28:09
4		16.000	4.000	6.400	04:56:18
5		32.000	8.000	12.800	09:52:36
6		64.000	16.000	25.600	19:45:11
7		128.000	32.000	51.200	1 D 15:30:22
8		256.000	64.000	102.400	3 D 07:00:44
9		?	?	?	?
10		?	?	?	?

 
List of Buildings