Olympus OM1 + 50mm/f1.8 + Expired Ilford FP4 Plus 125 + Home Development.
10mins intermittent agitation in a spiral developing tank with Ilfotec DD-X (1+4)
The FAQ pages on the main Eden website (see below for link...) describe the 'windows' or 'glass' of the Biomes as: constructed with; "...galvanised tubular steel, covered with a triple layer of ETFE (Ethylene TetrafluoroEthylene Co-Polymer) foil.
EFTE is a transparent, recyclable foil and should last for about 30 years. It is anti-static and therefore self cleaning. It is very strong, transparent to UV light and is not degraded by sunlight. The whole structure is guaranteed maintenance free for 25 years."
For more information on the Eden Project, have a look here.