The two are then mixed together with a tool similar to a diner’s milkshake blender to create the polyurethane foam that forms the hats.

The band's pyrotechnics had ignited the polyurethane foam that was used for acoustic purposes.

These were then prised out with a forklift, covered in protective layers of epoxy resin, polyurethane foam and wood, and loaded into two container units for transport.

They then wrapped it in clingfilm, constructed a box from plywood to contain it and mixed two chemicals together to create polyurethane foam, sealing all the gaps.

The hull was constructed from polyurethane foam and covered with fiberglass, and the wing panels were fiberglass throughout.