Fire Fighter Safety No. 2 Questions taken from Jones & Bartlett Fundamentals of Fire Fighter Skills (3rd Edition) Progress Indicator: Question 5 of 15 5.  Some gases found in mines are soluble and can be released from water.  These include ________. Choices: H2, H2S, and NO2 H2, CO2, and H2S H2S and SO2 H2, O2, and H2S