To put the odds in their favor, captains prepare for the worst. Most center the boat’s engines with the drives down to provide additional directional stability. Some drag a line behind to help hold the boat straight and to serve as a handhold if a crew has to swim for a tender that has broken free. Fuel tanks are kept full, the keys left on board, hatches and gates secured, water and food stowed, and foul weather gear kept ready in case a crew member has to run the boat offshore. They check bilge pumps but don’t depend on them, because batteries can lose power. It’s best if the tender has large-capacity freeing ports and scuppers and is watertight and self-bailing. And, of course, the yacht carries a sharp axe capable of quickly cutting the tow line.