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Wendy once bubbled...
To me techinal diving is any dive that exceeds 130' in depth and/or exceeds the no decompression limits on the recreational dive planner or requires that the diver have specialized training. Technical diving would be like deep diving, cavern and cave diving, any dive that has penetration (where you don't have a direct ascent to the surface), or diving that requires the use of mixed gases (like trimix).