The Hole is probably one of the most entertaining and safest spot when you manage to get inside without being followed. Containement is usually a very contested location so you must be careful when approaching and use your recon abilities.
When you are inside, you can block yourself in the crouched position. You can expect a lot of fights to occur around you. You must however remain hidden as long as possible. Other players may climb but people do not know that location and do not want to get stuck while fighting so they will not notice you. Do not shoot unless you are being shot at. Litterally anything can happen in front of you, you are safe there. You can be hit by missed grenades, it is fine since your ennemies will believe they hit the other team they are fighting.
If you are not in the zone anymore, you can send one of your team members (preferably a recon legend) to ensure the area is cleared. In case that legend is downed, do not try to go out the Hole. No one will expect other teammates around and unless you are scanned, your location is not revealed. Wait a bit to leave and keep following the playstyle guidelines.
If the final fight happens in front of you, the Hole is a very good spot since it is very likely that the other teams will not be looking at you. This allow you to flank them and quickly end the game.