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This is usually done by pausing or "doing stops" at various depths during the ascent to the surface. Most technical divers breathe oxygen enriched breathing gas mixtures such as nitrox and pure oxygen during long duration decompression, as… Similarly, diving masks with a built-in snorkel are considered unsafe by scuba diving organizations such as PADI and BSAC because they can engender a false sense of security and can be difficult to clear if flooded.[ citation needed]