The Israelis informed the US that they have begun “carefully testing out” flooding some of Gaza's tunnels with seawater “on a limited basis” to test the ability to degrade the tunnel network on a larger scale, a US official told CNN on Tuesday.
The Israelis are still unsure of whether it will work, the official said, but they assured the US that they are being careful to only test it in tunnels where they do not believe hostages are being held.
CNN has asked the IDF for comment.
The Israeli Prime Minister’s office said it believes 135 hostages are still being held by Hamas, some of whom are believed to be US citizens.
The Israeli military said earlier this month that it destroyed at least 500 tunnel shafts in Gaza and located more than 800 around the Palestinian enclave. The IDF said last week that many of the tunnel shafts "were located in civilian areas" and inside civilian structures.
In 2021, Hamas claimed to have built 500 kilometers (311 miles) worth of tunnels under Gaza, though it is unclear if that figure was accurate or posturing.