A subterranean troop carrier.

A Subterranean Troop Carrier would be able to transport troops underground to someone's base.
has very low hp and armor. When carrier is destroyed, it releases all troops housed within the carrier and then deals 25% damage to them. The carrier would have a troop housing limit similar to a army camp. Starting at 10 housing space lvl 1, ending at 60 housing space lvl 10. They would be extremely vurneable to mortar attacks. If the carrier is destroyed underground, all troops housed in the carrier would be destroyed.
The cost to make is 75k gold lvl1 and doubles that amount gold per upgrade ending at .
you can only have one carrier at a time. You would load troops into your carrier by selecting the desired troops from a drop down menu. When deploying the carrier, it will be shown coming either from the north or west side of the lot with a health bar signifying underground vehicle. Mortar are the only defense building that can attack underground vehicles and will pickup the underground vehicle once it is within its attack radius.
The carrier can only burrow next to a building and not through it, so when selecting where your vehicle comes up from underground, you must select any open space that isn't occupied by a building or wall.


lvl 1,
cost: 75k gold
hp 100
housing limit: 10
rate of speed underground: 30
Rate of speed above ground:5


lvl2
Cost: 150k gold
hp:150
housing limit:20
rate of speed underground:35
rate of speed above ground:6


lvl 3
cost: 300k gold
hp: 200
housing limit:30
ros underground:40
ros above ground:7


lvl 4
cost: 600k gold
hp: 250
housing limit: 40
ros underground:45
ros above ground:8


this idea is still a rough draft, but would like to hear some feedback on something like this.
discuss?