It's been five years since Israel imposed a total blockade on Gaza - a siege that was aimed at weakening Hamas, which controls the Strip.
But an underground world of smuggling tunnels, and the subsequent taxes imposed by Hamas, has actually helped strengthen the group.
While Israel's blockade has generally hurt the economy in Gaza, the tunnels have made their owners and Hamas a lot of money.
Al Jazeera's Nicole Johnston reports from Gaza.
Source: Al Jazeera