Bogle Bog was renowned for letting off marsh gas and sometimes gas bubbles ignited over Bogle Bog due to the marsh gas. Amos Brearly thought it was UFOs. Matt Skilbeck thought it was just marsh gas igniting.
Amos Brearly believe Bogle Bog to be haunted as he kept seeing flashes of light at night time over the deserted marshland. It was later discovered to be marsh gas igniting and letting off brief licks of flame.