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That’s interesting, do you mean specifically related to the helium or more to the overall “you’re going deeper and you will likely incur a deco obligation so any incident will need to be solved underwater”
On 21/35 the NDL at 130ft is about 3mins, depending on computer settings. So yes by the time you want normoxic trimix you are also asking to do deco. Deco = no direct access to the surface, so you're obligated to solve problems underwater.