Sweden
- Episode aired Oct 2, 2019
- 44m
![Underground Marvels (2019)](https://m.media-amazon.com/images/M/MV5BMTg2MGYwMDktMmNmOC00Zjk3LWFjMGUtZWNmMWQ3Njk4OTRlXkEyXkFqcGdeQXVyNDQ0NjMyOA@@._V1_QL75_UY281_CR155,0,190,281_.jpg)
Explores how Sweden has gone to extraordinary lengths to protect itself - by excavating 65,000 nuclear bunkers. Plus, Somerset's Cheddar Gorge and an underground first in Romania.Explores how Sweden has gone to extraordinary lengths to protect itself - by excavating 65,000 nuclear bunkers. Plus, Somerset's Cheddar Gorge and an underground first in Romania.Explores how Sweden has gone to extraordinary lengths to protect itself - by excavating 65,000 nuclear bunkers. Plus, Somerset's Cheddar Gorge and an underground first in Romania.