The emperor Hadrian built an enormous theatre in the city, made to seat 15,000 people.
(Source: whitman.edu/theatre/theatr…)
Source: perseus.tufts.edu/hopper/text?do…
But recent excavations have shown that the temple’s deadly effects were very real.
(Bill McKelvie 500px.com/photo/10403083…)
Normal atmospheric levels of CO₂ are around 0.039%, and 10% is enough to asphyxiate a person in 30 minutes.
(Pfanz et al. link.springer.com/article/10.100…)
“They hold their breath as much as they can," Strabo tells us. “I could see in their countenances a kind of suffocating attack”
Source: perseus.tufts.edu/hopper/text?do…
While the modern archaeologists uncovered the site, they observed birds flying near to the cave mouth and dropping dead from the noxious vapours.
(Pfanz et al. link.springer.com/article/10.100…)
(Pfanz, History of Toxicology and Environmental Health books.google.co.uk/books?id=igrUA…)
In the 6th century CE, the Ploutonion’s entrance was bricked up, & the temple was vandalised. Earthquakes in later centuries took care of the rest.
(📷Carole Raddato @carolemadge)
Pfanz et al, "Deadly CO2 gases in the Plutonium of Hierapolis": link.springer.com/article/10.100…
Pfanz, The Ancient Gates to Hell: books.google.co.uk/books?id=igrUA…
Şimşek, Landscape and History in the Lykos Valley: books.google.co.uk/books?id=T2XXD…