3.
Action to take
The responsibly for supporting your nationals overseas will usually rest with your Ministry of Foreign Affairs.
If you do not have a direct line, you can use these publicly available numbers:
UK: +44 207 008 1500
USA: +1 202 501 4448
Australia: +61 2 6261 3305
Canada +1 613 996 8885
You should act quickly - a delay at this stage could hamper rescue or support efforts later.
A specialist security or intelligence agency may be required to fully exploit (or understand the full value of) the information included in the SOS message.