How the world's longest underwater tunnel was built

What was one of the main challenges that made crossing the English Channel dangerous in the past?

• Lack of ships

• Stormy weather and rocky ships

• Pirates in the area

What made building the Channel Tunnel possible in the 1800s?

• Improved weather

• Better maps of the English Channel

• The discovery of chalk marl

Which of the following are true?

Select all that apply.

• The Channel Tunnel services over 20 million passengers a year.

• The Channel Tunnel transports riders across the channel in just 35 minutes.

• rains, cars, and trucks can travel through the Channel Tunnel.

• The Channel Tunnel was completed in 1990.

Towards the end of the video, the narrator says that humanity is at its best when breaking down barriers. What message do you take from this?