The Kettle for this mission can be found on an octagon-shaped platform to the left of Beaker's Depot. To get to it, ride the ride rail down to the lower level of the area. Near the ride rail that leads to the higher area, ride 2 moving blocks to a blocked off area filled with 3 sprinklers. A ramp on the area leads to a platform. Take a right onto the platform with the kettle
Location: In the second Octoseeker location, go to the sponge blocks on the far side. Below the set of four sponges are more, non-expanded sponges underneath. These lead to a crate containing the scroll.
Armor
Octoseeker Shakedown has 3 pieces of armor to collect.
Armor 1 Location:
On top of the a pillar. Swimming up the Octoseeker grants the player access to said pillar.
Armor 2 Location:
After getting the first and only key, one needs to go to the right. To the left of and slightly behind an Octotrooper, the second Armor piece can be found, laying on a sponge.
Armor 3 Location:
After reaching the second checkpoint, there is a sponge section. Upon reaching the platform, one can find the third Armor piece on a separate sponge, in line with the other sponges mentioned.
Sardinium
Location: Near the last Octoseeker over several sponges, the Sardinium is located in the far back of the trail.
Crust Bucket Ticket
Location:
After checkpoint four. Swimming up the Octoseeker grants access to a platform with a crate. The ticket is located next to this crate.