Watch it. The execution of the penguin-guided iceberg trap is highly creative, and getting to see Franky’s built-in sub in action makes it more than worth the 20-minute investment.
This is the most critical element of the episode. Episode 329 formally introduces the , the Straw Hat crew's deep-sea exploration submarine. Because this vehicle was built into the Thousand Sunny's Soldier Dock System, skipping this episode causes confusion for anime-only viewers when the sub casually reappears in later canon arcs. 2. A Rare Focus on Bounty Hunters
Nami and Franky take the Shark Submerge III underwater to investigate how massive icebergs are moving. They discover that a massive flock of trained penguins is physically pushing the icebergs to trap the Thousand Sunny. During this dive, they are ambushed by the bounty hunter Hockera.