General:
* The sub-level of the parking garage was flooded after the heavy rain.
* The research team discovered a hidden sub-level in the ancient tomb.
* The company's marketing strategy included a focus on reaching consumers at the sub-level of their needs.
Specific Examples:
* In gaming: The boss fight took place on a secret sub-level accessible only by finding a hidden key.
* In computer science: The code runs on a lower sub-level of the operating system, which is not accessible to the user.
* In psychology: The patient's subconscious fears were revealed at the sub-level of their dreams.
Remember, "sub-level" often implies something that is beneath or below another level. It can also refer to a hidden or less obvious layer, as in the case of the company's marketing strategy example.