Yuichi Wakayama was a scientist employed at the Ocean Exploitation Institute. During Interpol's search for the sunken remains of Mechagodzilla following his battle with Godzilla, Wakayama designed the submarine Akatsuki specifically for Kusakari to use in his search. His further services to Interpol in the following days proved invaluable. After Titanosaurus destroyed the Akatsuki, Wakayama hastily built a second sub, the Akatsuki II, for Akira Ichinose to use. And when Titanosaurus proved vulnerable to sonic impulses, Wakayama built a sonic wave oscillator for the Japanese Self-Defense Force.