Israel is said to be flooding Hamas tunnels — a tactic Egypt already used in 2013, but with sewage

• Israel is pumping seawater into Hamas' network of underground tunnels, per the WSJ.
• It's not a new idea. In 2013, Egypt flooded tunnels connecting Gaza to the Sinai, but with sewage.
• Two years later, Egypt pumped seawater, hoping to stop the movement of weapons and fighters.

Israel is said to be pumping seawater into the underground network of Hamas tunnels in Gaza.

The tactic may sound shocking — but it isn't new; Egypt did the same thing at least twice, one using sewage instead of water.