In addition to all the outdoor environments, there will also be indoor areas as well. According to Bungie, entrances between different types of areas should be as seamless as technically possible without any formal stage breakdown. Here we see a human soldier slowly approaching a well-guarded entrance. During the E3 presentation, a team of soldiers constantly interacted with one another setting up strategies and tactics. Perhaps this soldier will act as a decoy and draw the aliens into an ambush. This would be the sort of advanced gameplay that Bungie is hoping players will take advantage of once the game is released.