* No Detailed Records: While some records exist about the construction, they don't provide specific death tolls broken down by nationality.
* Large Workforce: Thousands of workers from various nationalities were involved in the project, making it difficult to track individual deaths.
* Time Span: The construction took place over several years, making it hard to compile consistent data.
* Safety Conditions: The tunnel construction was a dangerous undertaking. Accidents, illnesses, and even fatalities were likely, but documentation was likely not standardized.
Instead of focusing on exact numbers, it's important to recognize the significant human cost of this massive engineering feat. The tunnel's construction involved a tremendous amount of labor and risk, resulting in a tragic loss of life for workers of all nationalities.