Quote Originally Posted by goji View Post

Doesn't the tunnel slope downwards over it's entire length, with the north end lower ? That's my perception from looking out of the bus window, but such things can be misleading.
Believe it or not, even with a slight slope, they found that the tunnel floods in moderate to heavy rainfalls. This was discovered almost immediately after the tunnel was completed. (A project I called the "tunnel to nowhere"). To MFAS's point, with all the attention that drew the drainage problem has probably been corrected.

Thais aren't the best tunnel builders....but it sure looks nice.