Unreal 1998 May 7 beta: The Source & outro
Unreal build 180 or 181.
Not much interesting stuff in this beta besides this and Solaris.
https://unreal.fandom.com/wiki/DmSolaris
There are some rumors that this build is fake, but there's no consensus:
https://www.oldunreal.com/phpBB3/view...
https://www.oldunreal.com/phpBB3/view...