The Kaien I is a submarine designed by Captain Stern. It can even find and reach the Seafloor Cavern.


The Kaien I is first mentioned in Chapter 200 by Mack of Team Magma and debuts in Chapter 201.

The Kaien I is designed by Captain Stern and built by him and his crew, including Tuga, the construction advisor.

Team Magma wants the Kaien I because they want to reach the Seafloor Cavern, where Groudon is.

Ruby lures Mack onto the Kaien I, where he defeats Mack.


It is a large submarine.


  • It is also known as the Submarine Explorer 1


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