Exploring Sounds and Underground Spaces

The transcript discusses the sampling of FN 13 under a yellow cone, followed by the unexpected occurrence of thunder-like sounds underground. The speaker analyzes these sounds, suggesting they may indicate the presence of a void due to drilling in soft ground, which could be causing air movement and potential collapse.

What did the speaker initially do under the yellow cone?

• Found a hidden treasure

• Saw a bright light

• Sampled FN 13

• Heard a thunderstorm

How long did the unusual sound last?

• 1 minute

• 5 minutes

• 30 seconds

• 10 seconds

What was the speaker's reaction to the sound?

• Assumed it was a machine

• Thought it was extraordinary

• Ignored it

• Found it quite ordinary

What does the speaker suggest might be underground?

• An open space or void

• A large rock

• A hidden city

• A water reservoir

What condition of the ground does the speaker mention?

• Hard and rocky

• Soft and near something

• Wet and muddy

• Sandy and dry