How to investigate the Anomaly, get out of there alive and extract the Locked Diary.
Easy mission guide for solo or squad completion of Act 4 Tier 1 (aka Tier 4) Mission Bad Signal in Call of Duty Modern Warfare 3 Zombies mode.
00:00 Preparation
01:16 Breaking the Seals
10:23 The Toilet Strat
15:32 The Ledge Strat