Based on their presented intelligence, the bunker is accessible from adjacent buildings, not the hospital itself. The bunker is said to be located beneath the hospital.

https://www.timesofisrael.com/liveblog_entry/lebanese-hospital-opens-doors-to-journalists-aiming-to-disprove-idf-claim-that-its-housing-hezbollah-cash-bunker/

To all the journalists in Beirut, including those who participated in the press tour in the Al-Sahel Hospital, these are the entry instructions to Nasrallah’s bunker we exposed yesterday:

According to intelligence information, one of the entrances to the bunker, containing more than half a billion dollars in gold and dollars, is on the eastern side of the basement of the Al-Ahmedi building, located south of the Al-Sahel hospital.

The basement is on the second floor down (level -2).

It is important to note that it is possible the entrance is hidden by various means in order to make it difficult to find.

We invite you to this site in which Hezbollah is holding money that was taken from the Lebanese people.

Edit:

https://www.lbcgroup.tv/news/news-bulletin-reports/808268/lbci-enters-sahel-general-hospital-amid-israeli-allegations-of-hezboll/en

As journalists arrived at the hospital and began coverage, Israeli army spokesperson Avichay Adraee posted a message on X, urging the media to move from the hospital to the specific sites he had revealed on a map.

According to him, these sites would lead to Hezbollah’s underground bunker.

LBCI attempted to approach the building Adraee referred to. However, young men were stationed below, locking its iron gates with chains. They prevented the crew from filming.

Additionally, when LBCI tried to contact Hezbollah’s media representatives to demand permission to film inside the building, the request was declined.