In 1948, Siedlecki was accepted into the Szkola Morska — the Polish maritime academy in Gdynia. He was assigned as a cadet aboard the Dar Pomorza, one of the most celebrated vessels in Polish history. Built in 1909 by Blohm & Voss in Hamburg, the Dar Pomorza — whose name means "Gift of Pomerania" — was a magnificent full-rigged tall ship carrying up to 200 cadets on training voyages. She had been the first ship to sail around the world under Polish colors, the first to round Cape Horn flying the Polish flag, and was so beloved she earned the nickname the "White Frigate." She is today a museum ship in Gdynia.
On a training mission that brought the ship to the North Sea, Siedlecki made a decision that would define his life. When the Dar Pomorza put into port in Genoa, Italy, he left the ship and did not return. He sought asylum — a profoundly dangerous act. What followed was not simply emigration. After his escape, he worked with Radio Free Europe and trained with WiN — Wolność i Niezawisłość, the Polish Freedom and Independence underground — preparing to return covertly to Poland to support the resistance still operating there. Polish intelligence tracked all of it. Every detail would matter years later, in a hotel room in Warsaw.
By 1953, asylum was granted. He joined the U.S. Army, served five years, and earned his American citizenship. In America, his engineering talent and business instinct drove a decades-long career. From the early 1960s, his work at Kershaw Manufacturing improved railroad and cotton processing machinery. Later, as Assistant Chief Engineer at Continental Moss Gordon's International Department, he oversaw factory installations across the Balkans and the Middle East. It was returning from one of those assignments that led him to create the Melex.