The German soccer federation (DFB) said Derwall died Tuesday after a brief and serious illness, without giving details.
Derwall became head coach in 1978, after working as assistant to Helmut Schoen for eight years.
He lost the job in 1984, when Germany failed to advance from the first round at the European Championship in France. His successor was Franz Beckenbauer.
The discovery of the submarine has unveiled a few "inconsistencies." For example, how can one explain the fact that the sub was found where it needed to be searched for from the start?
The TurkStream, which runs along the bottom of the Black Sea from Russia's Anapa to Turkey, will consist of two lines, each with a capacity of 15.75 billion cubic meters of gas a year