The Israel Defense Force's chief spokesman Rear Admiral Daniel Hagari set high expectations, promising his briefing would expose to the world that Hamas uses hospitals as an instrument of war.
The BBC has no way of verifying the claims made this evening.
Hagari showed himself in one video pointing to what he called a covert terror tunnel which reached 20m below ground.
He said an electrical panel and protruding cables proved solar panels had been powering a bunker and this was being explored further by an Israeli military robot. There was no further evidence presented for the existence of a command centre but Hagari said investigations continued.
Attention then shifted to the inside of the Rantisi hospital, which Hagari explained was a basement that was disconnected from the rest of the complex and had been used as an armoury.
In another room, a piece of rope next to a chair leg was highlighted as proof that hostages had been held here along with the existence of a poorly plumbed toilet.
In one of the final videos, Hagari drew back curtains to reveal a wall with no windows. He said this would have been intended to conceal the true location of the building in any films that Hamas would want to make.
A neat, makeshift calendar on the wall was said to bear the name that Hamas gave their 7 October attacks and the ensuing days had been ticked off.
Hagari said there were already enough signs to show that Hamas - and hostages had been in the hospital and that more investigations were under way.
During the press conference, Israeli military spokesperson Daniel Hagari also said he had been to Gaza, to Rantisi children's hospital himself, and filmed what he described as "concrete evidence" that "Hamas uses hospitals as an instrument of war".
He said that in the basement under the Rantisi hospital, Israeli troops found "a Hamas command and control centre" where there were "suicide bomb vests, grenades, AK47 assault rifles, explosive devices, RPGs and other weapons, computers and money".
Hagari showed video of what he said was the entrance to a tunnel that was next to both a school and the hospital, with an electrical panel he said connected solar panels with wires that went down into the tunnel.
Video footage showed a deep shaft with a ladder down the side. "It's nothing else but a terror tunnel," Hagari told reporters.