Hiroto and Kazami have made a small but very important improvement in their relationship. However, the Build Divers and the Resistance are now overwhelmed by the attack of the mysterious Gunpla known as "Seltsam." The pendant that Muran entrusted to Hiroto and the others seems to become a key to turn the tide, but… Meanwhile, May begins gathering intelligence at Magee's bar.
Team Build Divers'
first underwater battle.
المعركة الأولى لفريق غوّاصي البناء تحت الماء
Der erste Unterwasserkampf
von Team Build Divers!
¡Ganemos la primera misión submarina
de Build Divers!
¡Ganemos la primera misión submarina
de Build Divers!
Premier combat sous-marin
des Build Divers !
Team Build Divers, prepariamoci alla nostra 
prima battaglia sottomarina!
Vamos para a primeira batalha
submarina do time Build Divers.
Первый подводный бой
команды Билд Дайверов!