SAR: sounds like a Search & Rescue is going in Dutch waters, although I'm not sure if it is real or a exercise.
Frequencies heard so far:
123.1000 MHz = NATO SAR
162.4750 MHz = Coastguard
Callsigns heard so far:
Coastguard 04
Pedro 02 (rotary wing a/c)
Pluto 01 (fixed wing a/c)
OSC