The 19-year-old from Indonesia worked as a lamp keeper on a floating fish trap, also known as a rompong, that was located almost 100 miles out at sea. His job was to light the lamps that were designed to attract the fish, a task he'd had since he was 16.
The small wooden hut floated along, anchored to the seabed by a long rope and suspended by bouys. But heavy winds snapped its moorings and soon, Aldi found himself adrift in the ocean.
He only had a few days' worth of supplies that were replenished weekly by a co-worker, and he quickly became frightened. He stayed alive by catching fish, burning wood from the hut's structure in order to cook the fish, and sipping seawater through his clothes to minimize his salt intake.
Aldi thought he was going to perish before help could arrive. In fact, at one point he considered jumping into the ocean to end it all, but instead, he turned to his Bible, The Guardian reported.
"(He) remembered his parents' advice to pray in times of distress. He had a Bible on board, so he did."
For an excruciatingly long 49 days adrift, he watched 10 ships sail past him. But finally, a vessel spotted him and he was able to make contact.
Aldi had waved cloths to catch each ship's attention but to no avail, so he ended up sending an emergency radio signal this time instead. Fortunately, the vessel's crew heard it and responded to his cries for help.