CNN: – What do you think about the idea of Elon Musk? “He can shove his submarine where it will give him unpleasant sensations.” This project did not have a single chance to successfully accomplish the task. He (the Musk) had no idea what the cave was like. I believe that this submarine was about 5 or 6 feet long, with a rigid frame, so it would not be able to overcome the corners and obstacles, it would not be able to swim even the first 50 meters of this cave. This is just a PR-trick. CNN: – But he visited the cave on Tuesday.