Ascending this retractable wall can be a bit tricky. Target the propeller to cause the wall to extend, allowing you to climb it. Before swimming up this feature, thoroughly ink it and make sure the wall is extended to its fullest. Swim along the inked wall sections before the wall retracts, causing you to fall. You’ll need to move fast if you want to grab the armor up top. Also, watch out for the Twintacle Octotrooper patrolling the adjacent area.
Use the Ink Cannon to shoot the Propeller Lift, then hop on board—use the Ink Cannon to completely coat the lift with your ink while you’re at it. While riding the Propeller Lift across the water, watch out for Octocopters appearing above. Eliminate these threats as soon as they appear, swimming through your ink as necessary to avoid incoming fire. There’s also an Octobomer who appears near the end of the ride. Target the propeller on the lift to cause the platform to reverse direction, making you a more difficult target for these enemies.
Pause on this ledge before dropping down—there are two Octolings waiting to ambush you. Take a moment to spread some ink in the area below and plan your attack. After dropping off the ledge, make a move for the Bubbler special located on the Propeller Lift to the left. Once you get the Bubbler, activate it and aggressively hunt down the two Octolings while you’re invincible. Alternatively, activate one of the two Propeller Lift platforms to get a height advantage on the Octolings. Once the area is clear, use the launchpad to reach the Zapfish.