The photo on the left was taken by STOMPer Aileen on Sunday, Mar 15 of the underpass Citylink Mall which connects City Hall MRT to Suntec City.
I walked through the underpass too that morning before the opening time of the IT show and it took me just 10 minutes since the crowds had not arrived yet. But look at the crush after the IT show opened!
Aileen was caught in the crush and
she estimated she took about 30-45 minutes to get from Suntec City to City Hall MRT. I think this picture is a powerful visual presentation of "practical and logistic reason" for NCC to move to One-North. Too bad Sze Zeng did not personally experience this but thankfully this report by Aileen should add to his "knowledge capital" ;-)