is one piece episode 62 filler?

The episode opens with the Straw Hat Pirates riding down Reverse Mountain into the Grand Line, when they are suddenly engulfed in a fog, but they didn’t seem to mind. Just then, Zoro hears a strange noise, though Nami says it’s probably just the wind.

Then Sanji claims he sees a mountain at the end of the path they were heading down. However, when the fog clears, they find out that it wasn’t a mountain; it was a huge whale!

At the rate they were going, they’d hit it straight on and crash.