Gazans get good at tunneling...

At least they are getting a skill....in the future, they could be building subway tunnels all across the world...

In houses along the steel wall separating Gaza and Egypt, the lights are flickering -- a sign that smugglers are digging tunnels below, their powerful drills weakening the flow of electricity.

Tunneling is the fastest-growing business in this impoverished border town and one of the biggest obstacles to any lasting Israeli-Palestinian truce.

Since Israel pulled out of the Gaza Strip a year ago, the number of tunnels for smuggling weapons, drugs and other contraband has more than doubled, evolving into an underground maze clawed out of Gaza's soft soil.

The largely unhindered weapons influx also heightens the threat of civil war between the rival Hamas and Fatah movements in Gaza and is souring Israel's ties with neighboring Egypt.

Israel says anti-tank missiles, tons of explosives and thousands of rifles have reached Gaza in the past year. Palestinian militants said they have imported longer-range Katyusha rockets -- they fired one earlier this year -- plus the means to upgrade their homemade rockets to reach deeper into Israel.