I heard the psssss sound already and is very loud.
Anyway, this morning upon reaching carpark, tire flat out.
Drove 10km to tan chong bukit timah. Drive very slow.
They say the sidewall a bit 'ruptured' and sidewall got scratch mark due to driving driving with flat tire.
The tire man patch up the hole from inside for me and say damage not serious...
I think i'll just drive for the time being and be in observatory mode.