Dig deeper tunnel.

Meaning: This means to make a longer or deeper hole in the ground. It's like saying, He needs to make a more extensive tunnel.

Choice of Words: Dig is a verb that means to move earth or soil with a tool or hands to create a hole. Deeper is an adverb that means to a greater extent or degree. Tunnel is a noun that means a passage or hole that goes underground. Together, they describe the act of creating a longer or deeper hole in the ground.

Alternative Expressions

Create a longer underground passage.

Meaning: This means to make a way that goes below the ground and is longer than before. It's like saying, Make the way under the ground go longer.

Choice of Words: Create is a verb that means to make or bring something into existence. Longer means having a greater length or distance from one end to the other. Underground means below the surface of the ground. Passage is a way or path that leads from one place to another. When you put them together, "Create a longer underground passage" means to make a way that goes below the ground and is longer than before.

Extend the tunnel downward.

Meaning: This means to make the underground passage longer by going further down. It's like saying, Make the way under the ground go longer by going deeper.

Choice of Words: Extend is a verb that means to make something longer or larger. Downward means in a direction that is lower or toward the ground. Tunnel is a passage or way that is dug underground. When you put them together, "Extend the tunnel downward" means to make the underground passage longer by going further down.

Related Expressions