No-Upgrade-Limit Sub

The No-Upgrade-Limit Sub is a monkey Sub with, well, no limitation to its upgrades.

Longer range ($150)
+25% attack range

Twin guns ($350)
Attacks twice as fast

Barbed darts ($450)
Darts pop 2 bloons each!

Heated tip ($300)
Darts pop lead bloons now.

Advanced intel ($600)
Can attack in range of other towers!

Airburst darts ($1,000)
Darts split into 3 when reaching the pop limit.

Triple guns ($600)
Shoots three times as fast as before.

Submerge and support ($1,000)
Can be set to submerge, removing camo from bloons.

Ballistic missile ($1,500)
Shoots a missile every second, aims at the strongest bloon, dealing 10 damage to it and releasing an explosion that deals 2 damage to up to 40 bloons in a 1/0/0 bomb shooter explosion.

Bigger Airburst ($1,600)
Splits into 8 airburst darts instead of 3.

Reactor sub ($2,500)
Bloons are popped 1 layer every second when entering in the Reactor sub's range (Submerged).