B777 first officer reported that a passenger illness resulted in a diversion.

Narrative:

We experienced a medical emergency approximately 1 hour into the flight. The other relief pilot and myself were on break for roughly an hour when we were asked to return to the cockpit due to a divert and medical emergency. Once we returned to the flight deck we coordinated with ATC; dispatch and maintenance regarding the divert and sick passenger. It was determined by all involved that continuing to ZZZ was not an option and ZZZ1 was the best choice in order to protect the operation and take care of the ill passenger. In addition; during the divert phase of the flight (last 1:30); we were in contact with dispatch and maintenance to determine whether or not we should dump fuel or land overweight. After a thorough discussion; we decided to dump 100;000 lbs. Of fuel. During the dump process; one of the fuel nozzles failed. It caused the dump rate to be cut in half. This added another layer of complexity to the divert. We called maintenance again to see if they could offer any help; which they could not. At this point; the entire cockpit crew came together to brainstorm and make sure all SOP was complied with. The medical guide and diversion planning guide were pulled out in order to ensure we had not forgotten anything. The flight attendants and passengers were briefed; and; most of all; we thoroughly briefed the approach; landing; and ground phase in order to ensure the medical personnel ability to reach the passenger in the rear of the aircraft at the gate in a timely fashion.once we arrived in ZZZ1 and parked at the gate we were all quite exhausted due to the medical divert and high workload. At that point a representative from flight operations entered the flight deck and asked if we would continue on to ZZZ. We all discussed our current state and came to the conclusion we did not feel safe continuing. The flight operations rep. Then said they needed one first officer as they had found a captain and one first officer. At that point we had been on duty for approximately 8 hours and with a proposed scheduled departure of xa:30 for ZZZ would have added an additional 9 hours of duty; resulting in a roughly 18 hour duty day; if the flight would in fact depart at xa:30. At that point I did not feel fit and comfortable continuing to ZZZ and believe it would not have been safe; especially taking into account our current state of mind and additional duty time.ultimately; it was my desire to continue and not delay the passengers any further; however; with safety in mind it simply was not prudent to continue.

Original NASA ASRS Text

Title: B777 First Officer reported that a passenger illness resulted in a diversion.

Narrative: We experienced a medical emergency approximately 1 hour into the flight. The other Relief Pilot and myself were on break for roughly an hour when we were asked to return to the cockpit due to a divert and medical emergency. Once we returned to the flight deck we coordinated with ATC; Dispatch and Maintenance regarding the divert and sick passenger. It was determined by all involved that continuing to ZZZ was not an option and ZZZ1 was the best choice in order to protect the operation and take care of the ill passenger. In addition; during the divert phase of the flight (last 1:30); we were in contact with Dispatch and Maintenance to determine whether or not we should dump fuel or land overweight. After a thorough discussion; we decided to dump 100;000 lbs. of fuel. During the dump process; one of the fuel nozzles failed. It caused the dump rate to be cut in half. This added another layer of complexity to the divert. We called Maintenance again to see if they could offer any help; which they could not. At this point; the entire cockpit crew came together to brainstorm and make sure all SOP was complied with. The Medical Guide and Diversion Planning Guide were pulled out in order to ensure we had not forgotten anything. The flight attendants and passengers were briefed; and; most of all; we thoroughly briefed the approach; landing; and ground phase in order to ensure the medical personnel ability to reach the passenger in the rear of the aircraft at the gate in a timely fashion.Once we arrived in ZZZ1 and parked at the gate we were all quite exhausted due to the medical divert and high workload. At that point a representative from Flight Operations entered the flight deck and asked if we would continue on to ZZZ. We all discussed our current state and came to the conclusion we did not feel safe continuing. The Flight Operations Rep. then said they needed one First Officer as they had found a Captain and one First Officer. At that point we had been on duty for approximately 8 hours and with a proposed scheduled departure of XA:30 for ZZZ would have added an additional 9 hours of duty; resulting in a roughly 18 hour duty day; if the flight would in fact depart at XA:30. At that point I did not feel fit and comfortable continuing to ZZZ and believe it would not have been safe; especially taking into account our current state of mind and additional duty time.Ultimately; it was my desire to continue and not delay the passengers any further; however; with safety in mind it simply was not prudent to continue.

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.

Attributes
ACN	1710256
Time
Date	201912
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 139 Flight Crew Total 11079 Flight Crew Type 1796
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Weight And Balance Flight Deck / Cabin / Aircraft Event Illness