Perform read and write operations when all nodes in particual datacenter are down in Cassandra

I have configured networktopology strategy among two data-centers. one data-center is having 3 nodes and another one with one node.

If all the nodes in one data-center will get down then i am unable to perform any read and write operations through java(using datastax java driver3.1 and cassandra3.7) as well as cql.

Here i am using GossipingPropertyFileSnitch as endpoint_snitch and consistency level ONE.

But as per my requirements application should work even if any one node is up in any data-center.

Can you please let me know how can i achieve this.

Thanks.