(CNN) Missing Titanic sub crew killed after ‘catastrophic implosion’.

Whether you’re at 30,000 feet or minus 13,000, love of extreme adventure is a harsh companion.  Your only defense is  vigilant safety culture.  To turn your back  is to give your companion a chance at your life.

Stockton Rush turned his back. At 13,000 feet, the water pressure is 5600 pounds per square inch, exerted on every inch of the Titan submarine. See:

Boeing, FAA, Space Shuttle Challenger, Richard Feynman, and Safety Culture

Boeing & Safety Culture Redux