That was where he'd finally proposed to her. At five am. They'd stayed out all night, dancing and promising their futures together, once he returned in a few months.
At zero six hundred, Toma was shipping out to the Pacific Ocean.
They never actually saw each other again, but they don't forget their promises, either. You can still see them out on the bridge, every year around five in the morning, every July third. Sometimes she tries to stop him from going off, but usually they just linger and love each other. It's pretty cool to see.