McRaven drew this lesson from the SEAL practice of conducting underwater attacks against enemy shipping. He described the experience in vivid detail: swimming over two miles underwater using nothing but a depth gauge and compass, approaching a ship tied to a pier where all light fades — the steel structure blocks the moonlight, the street lamps, all ambient light. The objective is the keel — the centerline and deepest part of the ship — which is also the darkest place, where you cannot see your hand in front of your face, where machinery noise is deafening, and where it's easy to become disoriented. It is precisely at this moment, McRaven said, that 'all your tactical skills, your physical power and all your inner strength must be brought to bear.' The metaphor extended far beyond military operations. Everyone faces dark moments — career failures, personal losses, moments of crisis where the path forward is invisible. McRaven's point was that these are not the moments to freeze or retreat. They are the moments that demand your absolute best, because what you do in the darkness defines everything that follows.