Hunt for Red October?

Here's the story of a murder onboard a submarine. This happened in August of last year and the sub sank. The murder of Swedish journalist Kim Wall has been identified as a sexual fantasy.

https:// www.cnn.com/2018/01/16/europe/danish-inventor-peter-madsen-charged-with-murdering-kim-wall-intl/index.html

https:// www.msn.com/en-us/news/world/danish-coroner-says-journalist-was-probably-strangled-on-submarine/ar-BBKynSe?ocid=spartanntp

https:// omgnews.today/police-arrest-submarine-builder-merciless-murder-video-evidence/