Propellers.

Under the sea,
or up in the air;
propellers, well - gee, 
they get you there. 

Don't worry, I'm not giving up the day job. 
The main was an air ambulance. It looked to be an actual incident, rather than a practice, as there was also a conventional ambulance at the scene.
The extra is the WidWed entry.

Many thanks to RSDPhotography for hosting.