It looks like this photo was taken from an aircraft but instead it was taken from the ground using a 180 mm lens. Thunderstorms are turbulent places. Aircraft avoid them because they are nothing but trouble. Inside is rain, snow, and hail along with strong updrafts and downdrafts. This storm looks like it opens into the entrance of an ominous cave. Try looking closely at cumulonimbus. They are one of nature's spectacular sights changing from one minute to the next.
The Weather Briefing Blog