Israel is considering flooding Hamas' underground network of tunnels in Gaza with ocean water as part of its plan to completely decimate the group, according to a report.

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An underground tunnel network has been around for decades and according to the Israeli Defense Forces, is how soldiers, weapons, and other goods move freely through Gaza.

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The myriad tunnels under Gaza are best known as passageways used to smuggle goods from Egypt and launch attacks into Israel. But there exists a second underground network that the Israel Defense ...

As Israeli troops advance through Gaza, their target is elusive and dangerous: The Hamas tunnels. The underground network includes military headquarters, sleeping areas and workshops to make rockets.

The home was near the center of the site and linked to a network of underground tunnels, archaeologists said. The hidden tunnel network extended for about 160 feet and had five different rooms.

That ancient tactic of going underground is still very much in use, so much so that the U.S. military has increased its focus on fighting in tunnels, one of the most dangerous forms of warfare.