Echolocation is the use of sound as a way of perceiving surroundings through sound waves reflected back from things and is a form of navigation.
The Flagisallus' echolocation has very powerful vibrations. It has an intense low-frequency pulse as well as an EM field, a combination of which is very dangerous to humans. Side effects include headaches, nose and ear bleeds, eardrum perforation resulting in temporary hearing impairment, and passing out. It also caused at least one fatality via the pressure causing the development of an aneurysm. The closer to the vibrations, the worse the effects. (SGA: "Echoes")
History[]
In 2006, the Flagisallus tried to warn the Atlantis expedition of a Coronal mass ejection and the pod went to Atlantis for safety. When Lt. Colonel John Sheppard and Dr. Rodney McKay went into the ocean in a Puddle Jumper to check the Flagisallus out, their echolocation caused Rodney's nose and ears to bleed and he passed out. Both he and Sheppard ended up with eardrum perforation. Later on, in Atlantis, Teyla Emmagan witnessed an image projection, fell backward and had a nosebleed. Dr. Carson Beckett also had a nosebleed and Dr. Elizabeth Weir passed out, along with an ear bleed and temporary hearing loss. Sergeant Bale developed an aneurysm from the pressure and died. (SGA: "Echoes")