The Nightmare Draws Near! This is the Sand-Sand Clan's Secret Base!

Vivi finds the bomb inside of the clock tower, but the Mr. 7 pair of Baroque Works are there to protect it. Vivi defeats them, but she realizes the bomb cannot be stopped so easily. It has a timer, and right before it blows up, Pell shows up and takes it into the atmosphere, where he sacrifices himself to save Alabasta.