Besides these sounds , the presence of chemical combinations was soon betrayed by their powerful odor , and the engineer and his companion were almost suffocated by sulphurous vapors .
Помимо этих звуков, присутствие химических соединений вскоре выдавало их сильный запах, и инженер и его спутник чуть не задохнулись от сернистых паров.