Question

how did Holmes guess that he was digging a tunnel​

Answer 1

Answer:

Holmes suspected that Spaulding was digging a tunnel because when Spaulding answered the doorbell, the knees of his trousers were wrinkled and stained and this confirmed his suspicion.

Explanation:

Hope this helps you and pls mark me as brainliest.

Answer 2

Answer:

Explanation:

Holmes goes on to explain how he guessed what the motive was. He thought about the assistant's practice of going down to the cellar on the pretext of developing photographs and guessed that he must be digging a tunnel. ... Holmes knew the burglars would have to act quickly because the bullion might be moved elsewhere.