snorkel

"The poor ventilation in the classroom made it difficult to concentrate. "

"During World War II, submarines played a crucial role in naval battles. "

"The submarine used its periscope to spot ships on the surface of the water while remaining hidden underwater. "

"My father uses a retractable pen for signing documents at work. "

"The aquifer's underwater supply of fresh water is crucial for the town's water system. "

"Example Sentence: "The swimmers practiced their strokes in the pool before the big competition." "

"After a long week of school, my vacation was a welcome freedom from studying. "

"The doctor is operating on the patient's leg. "

"There is not sufficient access to the internet in many small rural villages."

"The dog is exploring the backyard for his lost ball. "

"The runner was breathing heavily after the long race. "

"The submarine traveled deep beneath the waves. "