Frog Island: Information courtesy of Barnet Council, 'Putting the Community First'

There have been previous comparisons made between Pinkham Way and Frog Island in east London (although the latter is not 'fully enclosed, under negative pressure').

Barnet Council has produced some images (from 2009, as part of the Brent Cross Cricklewood development). [Click to enlarge images.]

(The 'Putting the Community First' is thought to be included as irony.)