He was speaking at a news conference at the Israeli embassy in London, where some of the hostages’ families pleaded for their release.
“They took her away, led away by terrorists… kidnapped and taken to Gaza,” Mr Hand said.
“And now we are just waiting for news.
“This is my worst nightmare – believe me, it’s a nightmare.
“If you have families and kids, just imagine one day [that] one of them is gone.
“The sheer terror of a nine-year old-girl down in those dark tunnels.
“Sheer terror and panic every hour of every day.
“She must be saying every day: ‘Where is my daddy – why isn’t he coming to save me?’”
Speaking to RTÉ, external earlier this month, Emily’s family said the Israeli Defense Forces now believed there was a “high possibility” she was among the people being held hostage by Hamas in Gaza.
Emily was in Kibbutz Be’eri, about three miles from Gaza, when Hamas launched its attack.
More than 100 people were killed in the kibbutz.
Israel began attacking Gaza after Hamas fighters crossed the border on 7 October, killing 1,200 Israelis and taking more than 200 hostage.
Since the Hamas attacks of 7 October, Israel has been carrying out military action in Gaza.