The lower photo above is of a long boat used to carry stuff through the tunnels from Egypt to Gaza. Someone left it out on the road in Rafah. It slides along the sand in the tunnel.
The tunnels are big business, and they have produced a smuggling culture in Gaza that good people hate.
The picture at the top shows an effect of the smuggling culture: the tunnels are built big enough to get a motorcycle through– they are building one to get cars through, I heard, but it either collapsed or isn't done yet– and there are a lot of flash new motorcycles on the streets of Gaza. Because there are no new cars. Mostly young men are on these motorcycles. They are a byproduct of the smuggling culture, and it upsets many Gazans to see them. The black shirt in the foreground is a designer shirt.
You see designer t-shirts on young men in Gaza, but you don't see newspapers.
All this lawlessness, it serves both Hamas and Israel. Both powers are in on it. It gives Hamas power, as the military authority in a lawless place. And Israel has to be in on the business, too. It could shut down the tunnels tomorrow, there are hundreds of them.
But maintaining Gaza in a penurious state of helplessness, charity and ignorance, you cannot blame it all on Israel, but Israel evidently conceives that to be in its interest.