Water based tower that shoots homing darts. Can upgrade to shoot at Bloons in the radius of any other tower. Can also upgrade to submerge and become a support tower.
~ Official Description
Monkey Subs must be placed on water but once in place they shoot homing darts. Can be upgraded to shoot at Bloons in the radius of any other Monkey and can be set to submerge and become a support unit.
~ BMC Description
Get to your battle stations, the Monkey Sub is in Bloons TD 5! The Monkey Sub has surfaced! With its array of powerful weaponry, support capabilities and functional upgrades the Sub is ready to join your Monkeys in the fight against the Bloons. Deploy the sub in the nearest bit of water and see how far you get!
~ July 23rd, 2015 "Monkey Sub is here!" description

Monkey Sub is a tower from Bloons TD 5 Mobile that was introduced on Friday, November 22, 2013 in the 2.3 Christmas update and on Bloons TD Battles on Friday, May 16th in the 1.8 update. It is unlocked from the Christmas gift (Popping 250,000 Bloons), along with 2 maps. This tower is a good starting tower on water maps since it is both cheap and powerful.

On Wednesday, July 22nd, 2015, The Monkey Sub has been released on the Flash version of Bloons TD 5 with a new appearance and different artwork.

0-0 Monkey Sub HD Flash


The Monkey Sub first made its debut in BTD5 Mobile. Eventually, it was made available in BMC Mobile, BTDB Mobile, and even BTD5 Flash. It can be upgraded as a support tower or as an attacking tower. Its signature special upgrade is the Advanced Intel, which allows the Monkey Sub to attack bloons within any tower's radius.

Path 1Edit

Upgrade Easy Medium Hard Impoppable Picture

Barbed Darts
Darts pop up to 3 bloons each.

$255 $300 $325 $360

Advanced Intel
Allows long range targeting of bloons that are in the radius of your other towers and receives camo detection in the radius of any tower with camo detection.

e.g: Ninja Monkey is on screen, Sub gains camo detection on bloons within the Ninja's sight radius.

$425 $500 $540 $600

Submerge and Support
Activate submerge using target option to permanently reveal camo bloons in its radius.

$425 $500 $540 $600

Bloontonium Reactor
Activate submerge using target option to detect camo, pop bloons, and reduce water tower cooldowns by 15% (doesn't stack).

$2,125 $2,500 $2,700 $3,000
Total Sell Amount $2,824 $3,320 $3,588 $3,984 ($5,136 with path 2 upgrades)
Total Cost $3,530 $3,800 $4,485 $4,980 ($6,420 with path 2 upgrades)

Path 2Edit

Upgrade Easy Medium Hard Impoppable Picture

Twin Guns
Twin guns double attack speed.

$380 $450 $485 $540

Airburst Darts
Airburst Darts split into 3 on impact for massively increased popping power.

$640 $750 $810 $900

Ballistic Missile
Ballistic Missile seeks its target over any distance and does extra damage to Ceramic and MOAB Class Bloons.

$1,275 $1,500 $1,620 $1,800

First Strike Capability
Ability: a devastating missile strike on the largest bloon on screen. Destroys up to a ZOMG bloon in one go, or many lesser bloons.

$17,000 $20,000 $21,600 $24,000
Total Sell Amount $15,670 $18,440 $19,916 $22,128 ($22,896 with path 1 upgrades)
Total Cost $19,600 $23,050 $24,895 $27,660 ($28,620 with path 1 upgrades)

Tower XPEdit

Level Upgrade at next level Total XP XP to next level
1 Barbed Darts 0 450
2 Twin Darts 450 1,050
3 Advanced Intel 1,500 2,500
4 Airburst Darts 4,000 1,000
5 Submerge and Support 5,000 3,000
6 Ballistic Missile 8,000 17,000
7 Bloontonium Reactor 25,000 35,000
8 First Strike Capability 60,000 60,000

Bloons Tower Defense 6Edit

The Monkey Sub makes a return in BTD6. It can be upgraded as a support tower or as an attack tower. It has also received a substantially greater choice of support/attack capabilities, including an upgrade that supports other Subs.

It is a Military class tower.

Path 1Edit

Easy Medium Hard Impoppable Unlock XP

Longer Range
Increases attack range.

$110 $130 $140 $155 125

Advanced Intel
Allows long range targeting of Bloons in radius of your other towers. Towers that have camo detection will allow the sub to shoot camos

$425 $500 $540 $600 750

Submerge and Support
Submerge targeting option permanently reveals Camo Bloons in its radius.

$425 $500 $540 $600 2,250

Bloontonium Reactor
Submerge to detect Camo, pop Bloons and reduce ability cooldowns of nearby water-based Monkeys by 15%.

$2,125 $2,500 $2,700 $3,000 11,000

Reduces ability cooldowns everywhere by 20%. While in range, Heroes earn XP 50% faster and water Monkeys ability cooldowns are halved.

$34,000 $40,000 $43,200 $48,000 33,000
Total Sell Amount

Tier 4: $2,352

Tier 5: $26,152

Tier 4: $2,769

Tier 5: $30,769

Tier 4: $2,989

Tier 5: $33,229

Tier 4: $3,322

Tier 5: $36,922

Total Cost

Tier 4: $3,360

Tier 5: $37,360

Tier 4: $3,955

Tier 5: $43,955

Tier 4: $4,270

Tier 5: $47,470

Tier 4: $4,745

Tier 5: $52,745


Path 2Edit

Easy Medium Hard Impoppable Unlock XP

Barbed Darts
Sub's darts can pop 4 Bloons each.

$380 $450 $485 $540 130

Heat-tipped Darts
Heat tipped darts allow popping of Frozen and Lead Bloons.

$255 $300 $325 $360 600

Ballistic Missile
Missile seeks target over any distance and does extra MOAB and Ceramic damage.

$1,275 $1,500 $1,620 $1,800 3,000

First Strike Capability
First Strike ability: A devastating missile strike on the largest Bloon on screen.

$11,050 $13,000 $14,040 $15,600 20,000

Pre-Emptive Strike
Automatically triggers MOAB Assassin effect whenever MOAB-Class Bloon spawns from the Bloon entrance.

$29,750 $35,000 $37,800 $42,000 45,000
Total Sell Amount

Tier 4: $9,265

Tier 5: $30,090

Tier 4: $10,903

Tier 5: $35,403

Tier 4: $11,774

Tier 5: $38,234

Tier 4: $13,083

Tier 5: $42,483

Total Cost

Tier 4: $13,235

Tier 5: $42,985

Tier 4: $15,575

Tier 5: $50,575

Tier 4: $16,820

Tier 5: $54,620

Tier 4: $18,690

Tier 5: $60,690


Path 3Edit

Easy Medium Hard Impoppable Unlock XP

Twin Guns
Added twin gun doubles attack speed.

$380 $450 $485 $540 150

Airburst Darts
Airburst darts split into 3 on impact for massive popping power.

$850 $1,000 $1,080 $1,200 1,000

Triple Guns
Adds a third gun for even faster firing.

$935 $1,100 $1,190 $1,320 2,750

Armor Piercing Darts
Special AP darts inflict more damage to MOAB-Class Bloons.

$2,550 $3,000 $3,240 $3,600 10,000

Sub Commander
Grants +5 pierce and +1 damage to all Subs in its radius.

$21,250 $25,000 $27,000 $30,000 25,000
Total Sell Amount

Tier 4: $3,493

Tier 5: $18,368

Tier 4: $4,113

Tier 5: $21,613

Tier 4: $4,442

Tier 5: $23,342

Tier 4: $4,935

Tier 5: $25,935

Total Cost

Tier 4: $4,990

Tier 5: $26,240

Tier 4: $5,875

Tier 5: $30,875

Tier 4: $6,345

Tier 5: $33,345

Tier 4: $7,050

Tier 5: $37,050


Update History (BTDB Mobile)Edit

With exception of the popular Airburst Darts upgrade, the Monkey Sub is fairly balanced. The 0/2 Airburst Darts Sub is still a pretty popular starting tower for those with Monkey Sub and water-dominant tracks, especially on Water Hazard, even when nerfed to a higher price.


Nerf Airburst Darts price increased ($750 → $1000).

Nerf Overall fire rate decreased (1.59 shots per second → 1.31).


Nerf Bloontonium Reactor price increased ($2500 → $2800).


Buff Bloontonium Reactor now automatically switches the tower into submerged mode upon purchase.


Nerf Fixed a bug where Bloontonium Reactor's water tower cooldown decrease stacked with any other Reactor in range. (Still works in BTD5 and BMC)


  • First Strike Capability is the first and currently only ability to be able to pop a whole ZOMG in one shot in BTD5.
  • The submerged Bloontonium Reactor can work similarly to a weaker Ring of Fire.
  • If a bloon is poppable by another tower, it can be popped by the Sub, with the upgrade Advanced Intel. This means that, like the Spike Factory and Ninja Monkey, it can pop Camo Bloons without either having an innate ability, by being in the range of a 0,2 or higher Monkey Village, or having an upgrade that says so.
    • Also, since the Monkey Village has a range of effect, the Sub is able to target bloons within that building's range as well.
    • A glitch can appear in BTD5 Mobile where a sub with 2/x on strong will attack Ceramic Bloons over MOAB-class bloons if the MOABs are only in a Glue Gunner's range, if also set to strong. The subs though, can attack the MOABs if no lower bloon rank exists with the glue gunner's range.
  • It does not do significant damage to high numbers of MOAB class bloons without the help of First Strike Capability.
  • This is one of three towers where Camo Bloon detection for the tower itself is a third tier upgrade. The others being the Mortar Tower and the Monkey Engineer. (Although technically, none of those towers can hit camo, they just remove it.)
  • This is the second tower that can be placed in water, the first one being the Monkey Buccaneer.
  • Interestingly enough, the Advanced Intel upgrade works on Heli-Pilots, meaning that a Monkey Sub can shoot anywhere with Advanced Intel if the Heli Pilot is in Pursuit mode.
    • This is no longer true in BTD6, where it only shoots near the Heli Pad.
  • A bunch of 2/3 Monkey Subs can withstand many Ceramic Bloons.
  • An 1/1 or 2/2 Monkey Sub has an appearance that combined 1/0 and 0/1 or 2/0 and 0/2 together.
  • A Monkey Sub with an Advanced Intel upgrade works well with a Village with Bigger Beacons as the range of the tower be as well the range of the Village.
  • In BMC Mobile, there is a special mission where the player receives four 1/1 Subs and a 2/4 Sub, which is broken but can be used in gameplay by repairing it for $8,000.
    • However, the mission is nearly impossible without the Broken Sub repaired in time, since a ZOMG will appear on Round 15 along with other MOABs. If repaired in time, the player must use the ability at the very start of the round, because the ZOMG will appear first.
  • There is a striking resemblance of the captain of the sub looking like the commander of the Warhammer 40,000 tank, once one upgrades to Barbed Darts, it looks like the captain wants to get close, so they can hit them with their dart.
  • Monkey Sub can hit bloons within the range of a Monkey Farmer, despite the farmer having no popping power.
  • In BTD5 Flash, a glitch with the Bloontonium Reactor is possible: if a Monkey Sub is upgraded to Bloontonium Reactor while in the radius of another water-based tower, the newly upgraded sub may remain at a 3/x tower rather than a 4/x tower, but the money will still be lost, and upgrading it now becomes impossible.
  • On the Flash version, the Monkey Sub tier 4 upgrades are unlocked at Rank 19 while the tower unlocks at Rank 20. Probably not intended.
  • If under the influence of a x/2 or a x/3 Monkey Village, the Ballistic Missiles do not affect Camo Bloons except if they are in the range of a tower. This glitch is also occured in BTD5 Flash.
  • No specialty buildings in BTD5 Mobile have a negative effect in this tower as it was added later by itself.
  • The Monkey Engineer and the Bloonchipper were added together and negatively effect each other.
  • A 2/0 Monkey Sub with a 1/2 Sniper Monkey can be useful in the early rounds but be careful as bloons may leak if you leave the Path 2 unupgraded.
  • When the tower was added in BTD5 Mobile, the player needed to pop 2 million bloons to unlock the tower and the bonus tracks. This was later changed to 250,000.


Start a Discussion Discussions about Monkey Sub

  • AoE of the missile strike

    2 messages
    • it's not mentioned, but the missile has a slight AoE and can affect nearby bloons, doesn't apply to Pre-Emptive strike tho the g...
    • This is true, and is already on the wiki page. "then spreading the rest of the damage to any other nearby bloons, along with a la...
  • Glitch in BTD5

    2 messages
    • Hi, I'm a massive BTD fan and according to this wiki, you unlock the sub at rank 20. I have played the game at multiple different sites, ...
    • Okay, I think I've solved it, once I played at Ninja Kiwi, and they had it. So I just gotta go there.
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