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For the building in BMC, see Bloontonium Generator.
Activate submerge using target option to detect camo, pop bloons, and reduce water tower cooldowns 15% (doesn't stack).
~ Description from BTD5 Mobile

Submerge to detect Camo, pop Bloons and reduce ability cooldowns of nearby water-based Monkeys by 15%.
~ Description from BTD6

Bloontonium Reactor (BTD5) is the fourth upgrade on path one for the Monkey Sub. It allows the sub to reveal camo, in the same way as Submerge and Support, but when submerged, it will also pop bloons with its camo revealer. As an added bonus, it reduces water tower ability cooldowns (First Strike Capability and Monkey Pirates) by 15% if they are within its radius. It should be noted that while the cooldown bonus does not stack with other Bloontonium Reactors, it will still stack with High Energy Beacon and Hotter Cooldown (85% total if hotter cooldown is fully upgraded, or 65% total on BTD5 Flash with the premium upgrade).

Update History (Bloons TD Battles Mobile)

3.2

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

3.6

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

Gallery

Trivia

  • This is one of the few upgrades that has infinite popping power. In BTD6 it has been nerfed to only pop 30 bloons at a time.
  • A submerged Bloontonium Reactor acts like a Ring of Fire, but it is used on water and it has camo detection.
  • In Bloons TD Battles, with a regular defense, it can stop a rainbow bloon rush.
  • In BTD5 Flash, multiple Bloontonium Reactors placed close to each other can stack their popping power, and 2 to 3 of them can stop even a full Regrow Ceramic if placed precisely.
    • In Mobile, Bloontonium Reactors popping power does not stack.
  • In BTD5 Mobile, the Bloontonium Reactor has sail planes. On the web version, however, this is not true.
  • If you look closely, the boat looks like a Los Angeles class nuclear attack submarine.
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