Gas Mixture Carried by Scuba Divers
This page is the CodyCross answer for the clue below from California, Group 1155, Puzzle 4 (Sourdough Bread).
Question is: Gas Mixture Carried by Scuba Divers
and the answer is: NITROX
Word Meaning:
NITROX — (metallurgy) An industrial process for case hardening (imparting greater surface hardness to) metal objects, involving nitrocarburizing (the diffusion of carbon and nitrogen into the metal) followed by oxidation.
Definitions from Wiktionary.