However, your installation sounds like it might be more than a five foot 'reach radius.' If you stretch a tape measure from the water to the outlet, is it more than five feet? Not a direct line, but around the edge of the deck etc. In other words, the way a human being could reasonably reach?
8-)
Oh, yeah...they definitely could NOT sit in the tub and reach this. Even if you laid on the deck over the nearest edge you could not unplug it. The tub is on top of the deck too, so it is hard to be in the water and reach the deck anyway, let alone under it.