"There is, in fact, an empty space behind the wall based on radar, which is very accurate, there is no doubt," Japanese radar specialist Hirokatsu Watanabe said, his hand hovering over a fuzzy blue radar scan he said indicated the presence of a false wall. The size of the cavity is not known." ARTICLE I've been following these events for months, so exciting!
The last few days they've done radar as well, as you will see in the article above. Interesting indeed...
It has been discovered that there are materials behind the walls, such as organic and metal materials. They have been scanning for over six months now, it's safe to say they can enter now, but run the risk of over thinking the process. Analysis paralysis / "paralysis by analysis is an anti-pattern, the state of over-analyzing (or over-thinking) a situation so that a decision or action is never taken, in effect paralyzing the outcome."