 The forward cargo compartment contained a shipment of of sodium sulfide, which is a chemically reactive flammable solid material that would release hydrogen sulfide gas if it had been exposed to moisture.Investigators concluded that the material was securely packaged in sealed glass containers within a wooden crate, and that the gas, which has a strong, foul odor, would have been detectable by the crew well before its concentration would have become dangerous.All tests for its presence on the recovered debris came up negative.