Surely a man of his wealth would have safe rooms for his family and rich guests.
I watched a piece about Necker island not too long ago. The place is/was extremely opulent. Only the VERY wealthy need apply.
Wiki says:
The island has accommodation for 30 people and rents out in total at US$65,000 a day, US$2,167 per person a day. The cost of staying includes access to two beaches, private pools, tennis courts, scenic views, a personal chef, a team of about 100 staff and a wide array of water sports equipment.
I just wonder how much profit you can turn if you have to rebuild the whole thing every few years...
He has a nuclear bomb proof basement....pretty sure they were going to be okay....