Page 0: - Chapter 540 titled LEVEL 6 INFINITE HELL. Page 1: - Volume 55 title page features Luffy sketch. Page 2: - Luffy Ivankov and Inazuma reach level 6 of Impel Down. - Guards and traps in level 6 corridor are destroyed. Page 3: - Ace's cell in level 6 is empty. - Luffy reaches the exact cell where Ace was held. Page 4: - Luffy and Inazuma stand at base of open lift shaft. - Small figure is visible high in the shaft. - Lift gate stands open above the group. Page 5: - Explosion damages the lift shaft area. - Group decides to use stairs instead of lift. Page 6: - Gas is released into level 6 area. - Stairs and lift exits are being sealed. Page 7: - Sleeping gas is deployed in level 6. - Luffy collapses from gas exposure. - Monitor room coordinates the sealing operation.