Final answer:
No standard depth is universally recognized as safe for jettisoning a mine, but it must be deep enough to avoid contact with shipping traffic and adhere to local and international guidelines. Specifics vary based on mine type and other factors.
Step-by-step explanation:
The question seems to pertain to the safe disposal of naval mines in marine environments. There isn't a universally agreed-upon depth at which a mine is considered safe to jettison without posing a hazard. The required depth would depend on various factors, including the type of mine, its activation mechanisms, and local maritime laws. Typically, the goal is to ensure that a jettisoned mine will not encounter shipping traffic or come into contact with people.
To ensure this, mines may need to be disposed of at depths where the pressure would render them inert or at locations that are not commonly traversed by vessels. It's essential that these operations are conducted following comprehensive safety standards established by international law and local guidelines.
A standard depth that might be considered is significantly deeper than any potential shipping lanes or human activity. However, specifics would need to be obtained from a resource that is current and authoritative, as this can change with new regulations and technological advancements.