Unit-ship:Diving Boat

__NOWYSIWYG__

Description
A boat that sails below the water`s surface is the ultimate sea weapon. Battleships also cannot defend themselves against them. Enemies will merely have their own diving boats at hand as a countermeasure.


 * During sea battles, Diving Boats deploy to First Strike position.
 * 5 Diving Boats fill a battlefield slot.

Construction times
$$Construction \ time \ = \left \lceil Base \ time \times 0.95 ^ {n - n_0} \right \rceil$$
 * where :
 * Construction time : The calculated time (in seconds) needed to construct the specific ship on the nth Shipyard's level.
 * Base time : The time (in senonds) needed to construct the specific ship on the Shipyard's first level that the specific ship can be constructed [ for this ship 1 hour = 3,600 seconds ].
 * n : The nth Shipyard's level.
 * n0 : The Shipyard's first level where the specific ship can be constructed [ for this ship is the  Level ].

1 - 10 = 11 - 20 = 21 - 30 = 31 - 38 =