The noise is more likely to play if 173 moves within close-range of the player. 173's appearance may be coupled with a very loud noise, meant to scare the player but doubling as an indicator that it is assuredly present (in the case of it not being immediately visible but, say, around a corner).Always blink before opening a door, as 173 might be in the following room, if not immediately on the other side.Leaving too many doors open can lead to 173 killing you from multiple rooms away without warning. If a door opens by itself, 173 is present and detecting it before an instant death is possible. Throughout the game, it is advised to always close doors when passing through, as it impedes 173's progress.173 always knows the player's location, meaning that attempting to hide or any other efforts to sneak past it are in vain.Never forget that the blink meter is only relevant when encountering 173 No other SCP requires constant line of sight.Always be conscious of the blink meter.

SCP-173 in the intro sequence after killing the two D-class Contrary to popular belief, immediately leaving the containment room has no effect on whether or not 173 will target the player only when the player is too close to 173 will it attack them. During the intro scene, when the lights start to go out, continue to maintain eye contact and distance with 173 until it attacks the guards.

Scp containment breach ultimate edition