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Commercial surface supplied standard is a compressor
Commercial surface supplied standard is a compressor not a "cylinder". A compressed gas (usually air unless it is saturation diving) tank is often used a backup (secondary air) however it is not usually the primary when there is a tender (somebody attending to the diver on the surface). So if the "cylinder supplying the umbilical is exhausted it can be removed and replaced with a full one at the surface" it is implied there is a tender. Compressed air tanks (usually scuba tanks) on a hooka are used for small(often solo) operations, such as boat hull cleaning. However there is rarely a tender. Even in snuba there is not usually going to be a tender available to change the tanks. Since this type of diving does not use coms (a diver tender communication device) there would not be anyway of knowing if the diver was out of air. I do admit the scenario described by this statement is theoretically possible, however the required situation is very much not the norm. This last sentence should be amended.Landrycameron (talk) 05:02, 11 April 2008 (UTC)
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Needs more citations, but as this should not be difficult, will delay promotion until there are fewer citations needed. I will get back to this, but assistance would be welcomed. • • • Peter (Southwood)(talk): 11:28, 26 September 2016 (UTC) Better now, so promoting, • • • Peter (Southwood)(talk): 14:40, 27 September 2016 (UTC)