*spoilers* VIP Bunker

[Angry_Viking]

Warning, there will be spoilers. If you haven't finished the game, read no further!

When you enter the VIP bunker from the outside, is it a point of no return scenario? Meaning you have no choice but to finished the game, you can't go back outside until you finished the story? I know there's a few items you can't inside and was wondering if i could get them and then exit the bunker and complete the ending later?

[Noctoculus]

You can choose to stay on the island. You can also save/reload and do the ending again.

[ps3wolvrine14]

You could get out if you use the mod for flight, it is basically noclip mode. The only thing is that you can't go to far into the compound otherwise the surface is no longer loaded. I'd personally recommend just using it to bypass the blocked door. After the strange metal door you want to stay insode the 'map' otherwise you risk having nothing actually loaded in. Even the surface.

Also flying a bit out of an underground area will unload that area. So definitely save first. The only way to reload that area is to pass through the surface entrance.
The bunker in question eventually leads you to a vertical point of around -200.