One means of dealing with human remains that seems bizarre today is the ossuary- the disinterment, collection, and often decorative display, of human bones. The macabre practice might seem bizarre to the modern world, but it is surprisingly common throughout history, occurring on multiple continents and in multiple cultures from prehistory to surprisingly modern times.
The first class of nuclear submarines were a learning experience for the Soviet Navy. The November class boats experienced numerous difficulties and accidents, culminating in what has been described as a potential “Underwater Chernobyl."