How was the 30 St. Mary axe built?

30 St. Mary Axe, commonly known as "The Gherkin," was designed by architect Norman Foster and constructed between 2001 and 2003. The building's unique shape and structure are a result of its innovative use of a steel frame and energy-efficient design features, including a double-glazed facade that enhances thermal performance. The construction involved advanced technologies and sustainable practices, emphasizing natural ventilation. Its distinctive form has made it an iconic part of London's skyline.