SQ B772 returns to SIN after loss of cabin pressure

[Wornout Rubber]

Regarding a rapid depressurization and subsequent actions, we do not know the full details of the SQ incident, and indeed whether they suffered a rapid depressurization at all.

However, if we look at an event in detail, we can perhaps work out the best option if it really does occur.

1. There will be an initial loss of pressure, which may be very sudden, and may be accompanied by an increase in noise and sudden changes in temperature.
2. The oxygen masks should now auto deploy. Some, however will not. (As demonstrated in Air Tests).
3. The passengers, now probably in a state of mild, moderate or extreme panic will (perhaps) put their oxygen masks on. Some will take a considerable time to put them on, others ( especially the young, elderly or infirm), may not even put them on at all.
4. About 6 panic stricken minutes later the aeroplane levels out at say, 10,000 feet, and the passengers remove their masks.

The cabin attendants can now assess the state of the passengers.

However, how do say 14 cabin attendants, who are not doctors or qualified nurses make an accurate assessment of the medical condition of say 300 passengers,who have just experienced a rapid depressurization?

The passengers may appear to be alright, but what is their real condition?
How much have they been affected by the event?
Did some of them not have their masks on during the descent?
Do some of them have heart ailments, and are perilously close to having a heart attack?
The majority of passengers will also probably be in a state of shock.

So what is the best course of action for the Captain now? (Assuming of course, the aeroplane structure is sound, and the cause of the rapid depressurization has been identified),

A) Not land at the nearest suitable, and land somewhere else where they may be a replacement aeroplane. Fly there at 10,000 feet, which is in itself an abnormal cabin altitude to fly at, and exposes the passengers to even more oxygen depravation than what they are normally used to when they fly. (Cabin altitudes are normally in the 4,000-6000 foot range). Keep the passengers in a state of shock and pehaps panic for longer than necessary because you need to get the aeroplane to where the replacement is. Risk having someone perhaps dying as a consequence, but no matter, the aeroplane will get back to base, or

B) Land at the nearest suitable aerodrome. Panic over, passengers can breathe sea level oxygen again, and real doctors can attend to those who need attention. If someone dies on finals, you would have done the best you could.