Diver Down

 is a Tier 5 Tank that upgrades from Submarine and Swarmdrive at level 60.

Design
The has identical barrels to Submarine but with Swarmdrive's decorative square atop its body.

Technical
Being a combination of its two pre-evolutions, the fires auto-swarms and can become invisible by staying still.

Trivia

 * While the tank's name is the same as a Van Halen album, it is more likely a reference to the series Jojo's Bizarre Adventure. Diver Down is a character in the series whose name was changed to Diver Drive due to copyright issues with the aforementioned album. This alternate name containing "drive" reflects this tank's Swarmdrive heritage.
 * Strangely, this tank has no relation to Diver at all.