That is an infant child's plastic feeding table. What is it doing down there, this is a crime scene and should be treated as such.
There is no way that these tunnels were built for anything but nefarious activities. How many churches have you ever gone to that has tunnels from one church to the next one? Zero. Walking from one synagogue to another is way easier than digging tunnels for months, do you think we are stupid? Remote Islands, tunnels, and submarines are used by these people to hide their illegal activity.