Warning: The following contains SPOILERS for the Superman and Lois season 3 premiere.The new Fortress of Solitude in Superman and Lois season 3 was revealed to have one particular upgrade that is more commonly associated with X-Men than the Superman Family. Superman has utilized a number of different remote Fortresses over the years, with most of them being located somewhere in the Arctic Circle. These Fortresses have likewise contained many exotic features, ranging from an alien zoo to an armory containing the many weapons Superman confiscated from his enemies over the years.

https://screenrant.com/superman-lois-fortress-solitude-xmen/