Editing Scuba set (section)

====Drop tanks====
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Stage sets may be cached along a penetration guideline to be retrieved during exit for convenience. These are also called [[Drop tank (scuba)|drop tanks]]. A drop tank is usually rigged to be carried in a sling mount, and has a regulator with a pressure gauge fitted and is deposited at a suitable place along the guideline, usually clipped to the line to ensure that it can be found again. The amount of gas in a drop tank can vary depending on how it is intended to be used. The gas mix must be suitable for the stage in which it will be used, and will be marked on a label, usually with the user's name, to avoid confusion. The cylinder valve is closed until the time of use.<ref name="Davis" />