Israel-Gaza live updates: IDF says it's discovered one of Hamas' biggest tunnels

Israel has recently started to pump seawater into Hamas’ underground network of tunnels, two U.S. officials confirmed to ABC News. It seems the flooding has been limited as Israel evaluates the effectiveness of this strategy compared to its other techniques.

The development was first reported by The Wall Street Journal. The Israeli Defense Forces has not publicly commented.

ABC News previously reported that Israel was exploring a range of options to take out Hamas’ tunnels, including flooding them with seawater -- an approach some worried could have devastating long-term environmental impacts and other ramifications for Gaza’s civilian population.

In 2015, Egypt used seawater to flood a section of tunnels in the southern stretch of the enclave to disrupt smuggling activity, which led to complaints about damaged homes and crops, as well as contaminated water supplies.

-ABC News’ Luis Martinez, Shannon Crawford and Justin Gomez

President Joe Biden said at a campaign reception that Israel is starting to lose support and Israeli Prime Minister Benjamin Netanyahu needs to "strengthen" and "change" the government to find a long-term solution to the Israeli-Palestinian conflict.

"This is the most conservative government in Israel's history," Biden said, adding that the government "doesn't want a two-state solution."

"You cannot say there's no Palestinian state at all in the future. And that's going to be the hard part," he said.

"Bibi's got a tough decision to make," Biden said, referring to Netanyahu.

Biden added, "In the meantime, we're not going to do a damn thing other than protect Israel in the process."

The president also recounted a recent conversation with Netanyahu, saying, "It was pointed out to me -- I’m being very blunt with you all -- it was pointed out to me that -- by Bibi -- that. 'Well, you carpet-bombed Germany. You dropped the atom bomb. A lot of civilians died.'"

"I said, 'Yeah, that’s why all these institutions were set up after World War II to see to it that it didn’t happen again -- it didn’t happen again," Biden said. "Don’t make the same mistakes we made at 9/11. There was no reason why we had to be in a war in Afghanistan at 9/11. There was no reason why we had to do some of the things we did."

-ABC News’ Molly Nagle, Mary Bruce and Justin Gomez

The Israel Defense Forces said it has recovered the bodies of two more hostages: 28-year-old Eden Zecharya, who was taken hostage from the Supernova music festival, and 36-year-old soldier Ziv Dado.

The IDF said its special forces recovered their bodies in Gaza and brought them back to Israel.

Dado was a husband and father of a 5-month-old girl.

"Ziv loved helping others, especially underserved populations," the Hostages and Missing Persons Families Forum said. "During his military service, he received certificates of excellence, was beloved by his commanders and superiors."

Zecharya's boyfriend died in the Oct. 7 attack while she was injured and kidnapped.

Zecharya "was filled with joy for life" and planned to study digital marketing, the Hostages and Missing Persons Families Forum said.

She was devoted to her two dogs, and "in her last phone call, she managed to ask her father to look after her dogs," the Hostages and Missing Persons Families Forum said.

As the humanitarian crisis in Gaza worsens by the day, ABC News spoke with several children in Gaza whose lives have been upended.

"We started building tents with our own hands," said Neda, an 8-year-old girl. "People became literally crazy. Whenever we found anything good or not, we would wear it."

"Oh world, save us from this war," Neda said. "We are young people, children who want to live like the rest of the children in the world."

She wondered, "They wanted to remove Hamas, but what is our fault?"

Rama, a 9-year-old girl, said her "house was shaking" from "all the missiles."

She asked, "If they bomb all the hospitals, where will we be treated?"