The Sonar Operator on Her First Watch

In the summer of 2018, Petty Officer Third Class Maria Sandoval sat in the sonar room of the USS Bainbridge, two weeks into her first deployment. The headphones pressed against her ears carried a wash of ocean sounds — shrimp clicking, distant whale song, the steady hum of the ship's own engines. Three times that watch, she noticed a faint, rhythmic pulse buried beneath the noise.…