The correct command to find the location of a database in the underlying storage is DESCRIBE DATABASE EXTENDED db_hr. This command provides comprehensive details, including the storage location. Other options like DESCRIBE DATABASE db_hr offer basic information but may not include the storage location. Commands such as DESCRIBE db_hr and SELECT location FROM db_hr.db are syntactically incorrect for this purpose. Relying on the default hive metastore directory is unreliable as databases can be created in other locations.