## Trimix family : Hyperoxic Trimix Hyperoxic [Trimix](Trimix.md), sometimes called "triox" or "helitrox" are prepared with a higher proportion of oxygen than the usual 21%. The most popular concentration is called 26/17 Trimix for 26% oxygen, 17% helium and 57% nitrogen. It requires decompression stops similar to [Nitrox](Nitrox.md) 32 and has a max operating depth (MOD) of -44 m. It is breathable on the surface and is mostly in use for shallow dives or to optimize the decompression time when ascending.