Did you know that Power Up survived that October 1997 restart of Half-Life story without much changes throughout development? Minor layout changes and aesthetic changes is the most that happened to it. Security Complex and Alien Research Lab also survived the restart up until sometime in 1998 (likely around April of 1998.) "Forget About Freeman" and Lambda Complex also survived, but with major changes after the restart in October of 97 and then had large amounts of the chapter changed and/or removed post-E3 1998. Surface Tension also survived from the original design, but had its starting map changed by April of 1998 and had Geo inserted into it post-E3 1998. Along with some possible unknown changes to the end of the chapter. Office Complex partially survived, but had major overhauls done to it after the restart. It is possible that Apprehension also survived the restart, but this chapter wasn't known til the development restart, so it isn't possible to prove it. But it is known that by early 1998 that the chapter was very similar to the final chapter.
was pre-geo surface tension mostly buildings?
community.lambdageneration.com/p… "You still went onto the Cliffside and ended up in the Military Camp section."