“The Titanic was unsinkable.”

The idea that the Titanic was unsinkable, a belief widely held before its fateful maiden voyage, largely originated from the ambitious marketing of its owner, the White Star Line. While the company and trade publications often qualified the term, describing the ship as "practically unsinkable" or "as unsinkable as man could make her," the public and media frequently dropped these caveats. This perception was fueled by the ship's unprecedented size and its cutting-edge safety features, particularly its sixteen supposedly watertight compartments, which were heavily publicized as making it impervious to disaster.

However, the ship's design had a critical flaw that ultimately contributed to its demise. Although the Titanic featured sixteen watertight compartments, the bulkheads separating these compartments did not extend to the top deck. When the ship struck the iceberg, it breached at least five or six of these compartments, exceeding the four compartments it was designed to withstand. As water filled the forward compartments, the bow of the ship sank lower, allowing water to spill over the top of the inadequate bulkheads into adjacent, undamaged sections, much like water overflowing an ice cube tray. This cascading effect ultimately doomed the vessel.

People commonly believed the myth due to the marvel of early 20th-century engineering and the advanced technology the Titanic represented. Designers and engineers of the era genuinely believed their creations were robust enough to handle any foreseeable maritime accident. This confidence, combined with the ship's luxurious appointments and the general lack of public understanding regarding ship design limitations, fostered a powerful sense of security that proved tragically unfounded. The shortage of lifeboats, which only accommodated a fraction of the people on board, further exacerbated the catastrophic loss of life when the "unsinkable" ship went down.