Logan is a name with Irish origins. The meaning of the name Logan is from the hollow. Common nicknames for Logan include Loag and Lo. Famous Loganâs include athletes Logan Bailly, Logan Coutre, Logan Kensing, and Logan Mankins.
During the Cambrian explosion, the atmospheric oxygen levels increased by up to 10 percent, and prior to that time the living creatures roaming the Earth were typically small, simple and often single-celled.
Since the pressure of all inhaled gases increases with increasing depth, there is risk of inhaling too much oxygen and developing oxygen toxicity. However, this is unlikely to occur in recreational diving because the depth limit (130 feet) effectively limits length of exposure to high oxygen concentrations.