The Temple by H.P. Lovecraft

"The Temple" is a short story written by H. P. Lovecraft in 1920, and first published in the pulp magazine Weird Tales in February 1925. It was the first story Lovecraft published in Weird Tales, and indeed was his first publication in any professional outlet.
The story is narrated as a "found manuscript" penned by Karl Heinrich, Graf von Altberg-Ehrenstein, a Lieutenant Commander in the Imperial German Navy during the days of World War I. It documents his untimely end at the bottom of the ocean