The Corps later installed two additional barriers on the canal, which significantly upped the voltage, and, at the time of my visit, it was replacing the original barrier with a more powerful version. It was also planning to take the fight to a whole new level, by installing a barrier that featured loud noise and bubbles. The cost of the bubble barrier was first estimated at $275 million, then later rose to $775 million. “People joke about it being a disco barrier,” Shea said. It was a line, it occurred to me, he might well have used at a party.