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Naval labs are where all your hull and armour research takes place. Once you have researched something, you may use it as many times as you wish. Researching takes resources, and the price usualy varies on what it is that your researching. You may only build one naval lab, however, you can upgrade it to unlock more hulls and armour for research. You can speed up your research by spending gold.
Hulls[]
Gunboat - Already unlocked at the start of the game.
Skirmisher - Requires a level
Longship - Requires
Marauder - Requires a l
Battle Barge - Requires a l
Leviathan - Requires a level 8
Sea Wolf- Requires a level 9
Floating Fortress - Requires a level 10
Armour[]
Iron I - Requires lab
Iron II - Requires alab
Iron III - Requires a
Iron IV - Requires a level 4 naval lab
Steel I - Requires a
Steel II - Requires a level 4 naval lab
Steel III - Requires a level 5 n
Steel IV - Requires a level 6 naval lab
Titaniumab
Titanium II - Requires a level 6 naval lab
Titanium III - Requires a level 7 naval lab
Titanium IV - Requires a level 8 naval lab
Depletab
II
Depleted Uranium III - Requires a level 9 naval lab and Titanium III
Depleted Uranium IV - Requires a level 10 naval lab and Titanium IV