They would last until someone in this Dimension invented dynamite or something equally potent.
Nobel invented dynamite in 1867, a substance easier and safer to handle than the more unstable nitroglycerin.
Alfred Nobel made his fortune out of inventing dynamite.
Fire-setting was one of the most effective rock breaking methods until 1867 when Alfred Nobel invented dynamite.
In the final construction years, the use of recently invented dynamite further accelerated the tunnel's completion.
He invented the telephone and dynamite, though others took the credit.
Ludvig was also the brother of Alfred Nobel, who invented dynamite and established five prizes in the family name.
Throughout the series he invents many modern gadgets, including a bicycle, an umbrella, dynamite sticks, and lasers.
He invented dynamite and established the Nobel prizes.
Some neighbors objected to the statue because of sidewalk congestion; others because Nobel invented dynamite.