What is the maximum allowable depth for open circuit scuba without prior approval?

The maximum allowable depth for open circuit scuba without prior approval is 130 feet of seawater (fsw). This depth limit is established to ensure divers can operate safely within their training parameters and to minimize risk associated with deeper dives, which can introduce additional complexities such as narcosis and oxygen toxicity. Staying within this limit allows divers to manage their breathing gas more effectively and reduces the time they need to spend on safety stops during ascent, further enhancing safety.

Diving beyond this limit typically requires additional training and approval to ensure that divers are adequately prepared to handle the increased physiological risks and to adhere to the necessary safety protocols. Therefore, maintaining the 130 fsw limit is crucial for recreational divers operating with open circuit systems.