Alright, I've got an exellent challenge for the synth-heads here.
A video game called ARC Raiders recently released, it's main soundtrack features a beautiful wailing siren-like sound, and it's dominant throughout the game.
I've been trying to recreate it myself, however I thought it would be fun for others to try their hand and flex their sound design muscles.
Here's the reference, at 16 seconds you can hear the siren-like sound I've been mentioning.