“The whole secret of avoiding shipwreck is to try and pass from the secant to the tangent”

“The whole secret of avoiding shipwreck is to try and pass from the secant to the tangent” is a nautical maxim drawn from the Matutina’s escape from the Caskets. It gives a concise name to the maneuver that saves the vessel: a dangerous collision becomes survivable when its force is redirected, though the makeshift solution cannot be repeated.

Meaning and Image

The expression sets two geometric paths against one another. A secant suggests a line cutting across a curve; a tangent suggests a line that meets it at a single point and follows a changed direction. In the passage, that contrast describes more than a course plotted on a chart: it condenses the principle of avoiding catastrophe by turning the force of an impact instead of resisting it directly.

The Matutina’s Escape

The maxim follows the Matutina’s passage by the Caskets. A beam struck the rock and turned the vessel; for a few seconds, it performed the work of an oar and took the place of a rudder. The ship emerged clear and the fast-running sea carried it beyond the reef. The surrounding account presents this maneuver as physically possible in a violent collision, comparing the tempest to a force that can be turned.

Limits and Significance

The escape depended on a resource that could be spent only once. The collision wrenched the beam from the men’s hands and swept it away, while loosening another beam would have damaged the hull. The maxim therefore expresses both the value and the cost of adaptation: a change of direction can avert immediate disaster, but the successful maneuver does not guarantee a repeatable means of safety. The Caskets recede behind the Matutina, their threatening rocks momentarily rendered harmless by the vessel’s passage.