The BO-AT (pronounced: BOH-at) or Buoyancy Operated Aquatic Transport was the "new" invention Dr. Heinz Doofenshmirtz wanted to market when he planned on flooding Danville. Described as being like a car that can drive on water, the BO-AT was really just a motorboat. His scheme was to open the Danville Dam and create a city like Venice, Italy or, according to him, to a lesser extent, Venice, California so that people would have to buy his BO-AT.
The scheme was foiled when Agent P opened the M.O.A.T., also known as the Metropolitan Oval Aquatic Trench, which then diverted all the water into going around Danville.
- This invention was introduced in the episode, "Interview With a Platypus," and was only mentioned one other time in "Phineas and Ferb Hawaiian Vacation".
- The Danville Dam is the same one he destroyed in "Oil on Candace".
- Heinz Doofenshmirtz is confused on whether a boat is called a BO-AT or a boat as he's been told ("Phineas and Ferb Hawaiian Vacation ").
- This invention has of course already been invented, it's a boat. This is the second of Doof's inventions that is not his own (The first was the Giant Rocket from "Dude, We're Getting the Band Back Together").