This is a support gun like the flare gun, despite the 'mine' name. Used for enemy ship location using sound rather than light.
This gun fires small floating mines 1/5th the size of a Phobos. The proximity range is much larger than a standard mine. Rather than exploding when an enemy draws near, it triggers and starts emitting a piercing, shrieking alarm. This lasts for a few seconds before the mine bursts in red fireworks. Any ship close to the Siren mine when it explodes is inflicted with a small amount of fire damage and has a chance of fires being set by the burst. Also causes a small amount of fire damage and has a chance to set 1 fires on the component hit directly. Though the mine
I think three to four shots would be a good 'active mine' count for this gun.