None currently known. But I suggest that this is not a very high-priority problem at the moment; if you solve the more pressing ones, you'll have literally billions of years to figure out an escape path from the universe.
Or billions of years of despair knowing there isn't one...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.