An Israeli strike on an oildepot three weeks ago has caused thousands of tons of oil to spill into the Mediterranean Sea and foul the country's beaches.
With one eye on the site a derelict oildepot at the end of the Arsenale, the defunct Renaissance naval yard Mr Cai chose large-scale installations that would not be cowed by the unwieldy spaces.
In predawn raids Tuesday, NATO flew triple the usual number of planes in attacks that struck oil refineries, a fuel depot, bridges and a factory in five Yugoslav cities and an area near the Kosovo capital of Pristina.
Fuel from Grangemouth is distributed right across Scotland, although other distribution points like Shell's oil terminal in Aberdeen and the Inverness depot have also been picketed.