sentence: design and appearance the shōnan maru 2 is similar in design and appearance to whale catchers used by the icr such as the yūshin maru series , the primary external differences being the presence of a crane near the aft end of her superstructure used to launch and recover rigid-hulled inflatable boat ( craft not carried aboard other icr whale catchers ) , minor differences in the design of the bridge section and forward catwalk , and the absence of a structure on her prow used to recover fired harpoon .