He just wants to know if his wife and three children have survived.
"They are OK, I swear," the rescuer says in video obtained by Reuters.
Many others were killed.
Israel's military intensified its bombing of southern Gaza overnight, pushing the Palestinian death toll past 6,500 on Wednesday, according to Gaza's health ministry.
International calls are growing for a pause in fighting to let aid into the enclave and prevent more deaths.
Health officials said dozens were killed in the south, where hundreds of thousands fled after Israel warned them it would attack the north.
It's seeking to wipe out Hamas militants who mounted a killing spree in Israel on October 7 that took more than 1,400 lives.
Hamas also seized 222 hostages, among them at least 28 children. These blood-stained teddy bears in Tel Aviv call for their return.
Qatar's prime minister, Mohammed Bin Abdulrahman al-Thani, suggested on Wednesday there was some progress on hostage negotiations and he hoped there would be a breakthrough "soon."
In Khan Younis, Ali Daba says he has split his family up for safety - with half his children staying with his wife in Gaza city.
He's bought them all bracelets as a way of recognising them if something happens.
"I have seen bodies ripped apart - you can't tell who is who. If something happens and they are torn to pieces, this way I will recognise them from these bracelets."
Israel's military said strikes on Gaza over the previous 24 hours had killed Hamas operatives including the head of its battalion for Khan Younis, Tayseer Bebasher.
And that it had stopped a cell of Hamas divers trying to enter Israel by sea near Kibbutz Zikim.
