it might be a tiny piece of plastic caught somewhere

Remember there are Waterslides for this model here and here

it is incredibly detailed and poseable

the GN Archer is a variable Mobile Suit piloted by super soldier Soma Peries

Beam Rifle and Shield

HG RAG-79-G1 Gundam Marine Type (Gundiver) - P-Bandai 1/144 Sangoku Soketsuden it might be a tiny[ACCESSORIES]Underwater Use Beam Rifle (Rifle Cover Included) Harpoon GunBeam PickFrom the Mobile Suit Gundam THE ORIGIN MSD, the RAG 79 G1 Underwater Type Gundam joins in the HG Origin MSD kit series! With entirely new molded parts, from head to toe and armaments! The rifle also comes with its rifle cover, making it easier to shoot down any enemies underwater. The underwater type Gundam demonstrate an unparalleled style when it comes to underwater