Far-Out Fact The amount of liquid fuel in the ET is about the same as the volume of water needed to fill an Olympic swimming pool. Far-Out Fact The ET is 47 metres (154 feet) long and 8.4 m (27.6 ft.) wide. That is almost exactly the same size as the ÒGrand GalleryÓ corridor running through the centre of the Great Pyramid at Giza in Egypt. Far-Out Fact The diameter [link to glossary] of the ET was limited by the height of the Louisiana factory where it was built.