The site for the museum presented a number of extremely unusual urban contextual problems. It was a typical urban remnant, a car park; a forgotten left-over space below an approach ramp to Waterloo Bridge. One would not normally choose to build a sophisticated, acoustically sensitive building beneath a bridge structure that moves back and forth by up to 100 mm a year, that resonates with traffic noise, requires access for regular inspections and leaks unpredictably - but that was the site.