Flash Barrel

A Flash Barrel (フラッシュバレル, Furasshu Bareru) is a barrel that contains the red flare inside use to signal Thriller Bark. It floats on the ocean at the entrance of Florian Triangle, waiting for any passing ships. Whenever opened it will shoot out a red flare after which Perona's Ghost Network will start spying on them. This was a clever trick to pull sailors to Thriller Bark.