First things I did is go to Settings, more, change mobile networks to LTE/CDMA rather than Global. Put location setting on battery saving. Screen on auto brightness and make sure social and email apps aren't syncing more than 1x per hour under Accounts settings. Also, for WiFi advanced settings, I change always on to only when plugged in and then uncheck the box for always scanning even when WiFi is turned off. That should help.
PS. Since you are in a bunker, you could either turn off mobile data to get a better CDMA only signal or just go to airplane mode and use Wi-Fi at work (no phone or data). There are apps like Tasker that can automate this kind of stuff too. Best of luck!
Sent Turbo fast from my 64GB Droid Turbo