The Elizabeth St drain
  Mal Rowe

Someone using the name Portia Venezia has posted a pic to Reddit showing
one side of the drain under Elizabeth St exposed as part of the works to
establiush a micro park at the south end of Elizabeth St.

See:

https://preview.redd.it/xqsk8n985zb71.jpg?width=1960&format=pjpg&auto=webp&s=91a4ceac4b68832a0bfdbd29af1bd44c195bf9ba

I understand that there are two drains this size - one each side of
Elizabeth St.

Mal Rowe - who was passing through when the flood of '72 happened