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Experimental study design. In (A) the accommodation chamber; (B) diving profile: divers were onboard from 20 to 26 December, then were compressed to 45 m and worked there until 5 January. Then they were compressed to 70 m and worked between 70 and 80 m for about 8 days. Finally, divers were progressively decompressed to surface (with a brief stop at 23 m for potential supplemental work at that depth, not performed).
