At the intervals along this central area Graham noted openings, pits, apparently the heads of staircases going down with people ascending out of them and descending into them.

The struggle it seemed centred about the one of these nearest to him.

People were running down the moving platforms to this, leaping dexterously from platform to platform.

The clustering people on the higher platforms seemed to divide their interest between this point and the balcony.

A number of sturdy little figures clad in a uniform of bright red, and working methodically together, were employed it seemed in preventing access to this descending staircase.