Last summer a bunch of us were heading west through Romania in clear skies, except for one huge Cb on our track. All the others and ourselves asked for deviations to avoid....except one aircraft.
On the Nav display we watched on the TCAS as he entered the Cb.
His altitude deviations indicated he was having quite a wild ride! The FO and myself watched in total disbelief as he went up and down in excess of 800' within seconds of each altitude deviation. Then he leveled out on the otherside.
He made it, but by
only just!
If you calculated our deviation in miles, it probably added up to what he was doing in feet
halas