Advance
Dry Dock
It is a port building that provides the necessary infrastructure to construct and repair boats in isolated dry basins that can be flooded at will. This ease of access to the hull of the ship improves in great measure the efficiency and capacity of the building process.
Advance tree
It has no requires, so the game files don’t say where this goes. When the game builds the 
Discovery tree, it adds this at the end of a branch with room for it, in the same spot in every campaign.
Belongs to 1
- DiscoveryAge
Required by 2
ai_weight = {
if = {
limit = {
has_ports = yes
}
add = {
value = 100
multiply = num_of_ports
divide = num_locations
}
}
}
ai_preference_tags = { exploration }