A pneumatic speargun for spearfishing and a related method of loading and firing includes a cylinder having a head and a body with a hand grip, a slide guide for a spear, a reservoir for a pressurized fluid, and a barrel connected to the reservoir. Treatment may further comprise administration of one or more other agents, such as analgesics, anti-inflammatory and central nervous system -partitioning phosphodiesterase inhibitors, antidepressants, neuroleptics, benzodiazepines, and procholinergic agents. The back-to-back semiconductor device module may be secured to a carrier substrate in a substantially perpendicular orientation relative to the former.