Bloons Tower Defense X Wiki


The Monkey Submarine, often referred to as the Monkey Sub, is one of two water towers in the game. Starting as a waterborne Dart Monkey with seeking darts, it's pretty average, but lasts from early-game to late-game with the right upgrades. Costs $440.


Monkey Submarine
Barbed Darts
Darts pop 3 bloons
Tier 1
Total cost: $770
Unlock the challenge for this tower by unlocking 5L (Blockade).

Complete the challenge to unlock 3S (Smart Darts).

Twin Guns
Shoots twice as fast
Tier 2
Total cost: $1,300
Airburst Darts
Darts split into 3 more darts
Tier 3L
Total cost: $2,250
Support & Submerge
Submerged subs can reveal camo, heal stun
Tier 3M
Total cost: $2,300
Rapid long range explosives
Tier 3R
Total cost: $2,350
Smart Darts
High IQ Darts
Tier 3S
Total cost: $3,600
Rank 22
BP.png x3

Assault Sub
Increases fire-rate (darts split into 7 rather than 3.)
Tier 4L
Total cost: $4,650
Rank 22
BP.png x4

Bloontonium Reactor
Pops bloons in area, better against shields
Tier 4M
Total cost: $5,300
Rank 22
BP.png x3

Ballistic Missile
Does heavy damage to armored bloons and Moabs
Tier 4R
Total cost: $4,900
Rank 22
BP.png x15

Control Tower
Complete control over popping power
Total cost: $10,100
Rank 46
BP.png x9

Temporarily stops bloons from leaking
Tier 5L
Total cost: $10,650
Rank 46
BP.png x9

Anti-Matter Reactor
Speeds up abilities, pops more bloons
Tier 5M
Total cost: $14,800
Rank 46
BP.png x11

First Strike
Powerful Strike that can pop a ZOMG
Tier 5R
Total cost: $20,900
Rank 46
BP.png x25

War Mastermind
Smartest monkey gives Weapon Superiority
Total cost: $33,100

Total BP.png to fully unlock: 79


  • Can pop camo with all middle and stacked upgrades; the sonar sweeps also permanently remove the camo ability from affected bloons.
  • Can pop lead with 4M, 5M, all stacked upgrades, and the torpedoes, missiles, and ability from the right upgrades.
  • Can damage HTAs with all stacked upgrades, the sonar sweeps from 4M and 5M, and the torpedoes, missiles, and ability from the right upgrades.
  • Each tower in the attack range of a Monkey Submarine increases the sub's attack range (but not sonar range).
  • Unlike the official games, Submerged subs still keep their previous attacks (as BTDX lacks targeting options), allowing them to still attack with darts.



  • Brilliant all-around tower.
  • Effective against multiple bloon types.
  • Very effective against camo bloons.
  • 5R is very effective against ZOMGs.
  • Has massive popping power, especially 4M and 4L.


  • Not effective against HTA.
  • Very weak aganst DDT's.
  • Has very limited space because it's a water tower.
  • Struggles against Nightmare bloons.
Dart Monkey.png Tack Shooter.png
Boomerang Thrower.png Sniper Monkey.png
Ninja Monkey.png Bomb Shooter.png
Monkey Submarine.png Charge Tower.png
Glue Gunner.png Ice Monkey.png
Monkey Buccaneer.png Monkey Engineer.png
Monkey Ace.png Bloonchipper.png
Monkey Alchemist.png Monkey Apprentice.png
Monkey Village.png Banana Tree.png
Mortar Launcher.png Dartling Gun.png
Spike Factory.png Heli Pilot.png
Plasma Monkey.png Super Monkey.png