This map is a 1-player Choose Your Own Adventure style minigame (based on the classic 80s book series), set on the USS Enterprise D from Star Trek the Next Generation.
In this game, a warp core breach is imminent, and you are given several choices as to how to approach it. Will you try to repair the core? Escape in a shuttlecraft? Transport down to the planet below? It's up to you.
However, like the classic books, there is only one way to survive, and many ways to die. And to keep players on their toes, the game randomly selects which choice is correct every time you play.
https://www.halowaypoint.com/en-us/games/halo-5-guardians/xbox-one/map-variants?lastModifiedFilter=Everything&sortOrder=BookmarkCount&page=1&gamertag=Starship%20Forge#ugc_halo-5-guardians_xbox-one_mapvariant_Starship%20Forge_2d9198fa-1029-4fee-9f1a-17cf5f10ff65
Requires Star Trek Adventure gametype, which you can find using the in-game browser on my fileshare (GT Starship Forge). I'd link to it, but a glitch is preventing any gametypes based on minigame from showing up on Waypoint (regardless of search visibility setting).