There's trouble at the beach.  The four swim club members are forced to revisit their motivation to swim.  After Rei asks Makoto about his odd behavior during the training camp, Makoto tells them about his past.
Oh, it was your underwear.
Oh, es war deine Unterhose.
Ah, los calzones.
Ah, los calzoncillos.
Ah, c’était ton slip.
Oh, erano le tue mutande, eh?
Ah, era a sua cueca.
А, это были твои.