Never explain the light

There is a light under the water, about a mile offshore.
We sent a crew out.
They never came back, no answer the radio, either.
You can’t see it in the daytime, but at night, it’s bright enough to light up the ocean.
We called the Coast Guard, and they said to just let it be.
“What about the crew?” I asked.
“Hold a memorial service,” said the Coast Guard. “And fish elsewhere.”
They won’t tell us anything else. The Navy just sends us to the Coast Guard.
Whatever it is, it’s getting brighter.
And now, it’s starting to sing.