Solve it Sundays: Submersible

By now, your weekend is probably pretty close to done, but that doesn’t mean you shouldn’t stop relaxing.

Take a seat on the couch and try to solve this week’s riddle.

There are many pressing concerns when one is in a submarine, whether it is a time of war or not. However, one of the most important is for the captain to ensure that his boat not be permitted to rest on the bedrock of the ocean floor, even for a moment. Such an event may well prove fatal for the entire crew.

Can you say why?