"as I live over here I can tell that the "rainy season" is full monsoon. It rains so hard that local roads can have 18" of water in them in minutes. To go pot holing at such times was lunacy!
It wasn't the monsoon, it was a storm that flooded the tunnels.
Monsoons=rain=storms. Usually sort sharp bursts during the summer months in that part of the world. Often leads to flooding. Not like Manchester, where I understand you are a frequent visitor
, where it just drizzles for 20 minutes in every quarter of an hour
That's why they got the cotton trade.
The monsoon wasn't due for another month, that's why they went down the tunnels. The storm was an isolated one."