B757-200 flight crew reported losing all cabin pressure while in cruise.

Attributes
ACN	1471979
Time
Date	201708
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Pressurization Control System
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 150 Flight Crew Total 12500 Flight Crew Type 757
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 250 Flight Crew Total 26000 Flight Crew Type 12000
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

Total failure of both cabin auto controllers resulting in loss of cabin pressure at a cruise altitude of 38;000 ft. As the aircraft was climbing through 37;500 ft going to a cruise altitude of FL380 we experienced a total failure of both cabin auto controllers. This was accompanied by the cabin altitude warning EICAS and buzzer and both cabin auto 1 and 2 controllers EICAS warning messages. We both looked at the cabin and it was climbing through around 13;000 ft. We both immediately got on O2 with the mask at 100% and emergency. Once going on O2 we [advised] ATC and diverted while descending the aircraft to a safe attitude of 9000 ft and going through the appropriate checklist. Aircraft was diverted and landed back safely. Very scary event since it was very insidious and snuck up on us quickly with no notice until the cabin attitude warning went off.

Original NASA ASRS Text

Title: B757-200 flight crew reported losing all cabin pressure while in cruise.

Narrative: Total failure of both cabin auto controllers resulting in loss of cabin pressure at a cruise altitude of 38;000 ft. As the aircraft was climbing through 37;500 ft going to a cruise altitude of FL380 we experienced a total failure of both cabin auto controllers. This was accompanied by the cabin altitude warning EICAS and buzzer and both cabin auto 1 and 2 controllers EICAS warning messages. We both looked at the cabin and it was climbing through around 13;000 ft. We both immediately got on O2 with the mask at 100% and emergency. Once going on O2 we [advised] ATC and diverted while descending the aircraft to a safe attitude of 9000 ft and going through the appropriate checklist. Aircraft was diverted and landed back safely. Very scary event since it was very insidious and snuck up on us quickly with no notice until the cabin attitude warning went off.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.