Hydrolyzes intracellular trehalose to glucose (Probable). The disaccharide trehalose serves as a storage molecule for energy and carbohydrates that is mobilized during nutrient stress (PubMed:9075620). alpha,alpha-trehalose + H2O = alpha-D-glucose + beta-D-glucose Carbohydrate degradation. Belongs to the glycosyl hydrolase 37 family.