The Trieste used a cone shaped plexiglass to withstand the pressures, but it partially failed when it cracked on the way to the bottom of the Challenger deep. Nerues likely suffered a failure due to a component that had been overstressed one too many times by the repeated dives. The Trieste was rebuilt so many times it contained hardly any of the original parts. However, the steel diving sphere housing the crew of two and built by Krupp was reused in the construction of Trieste II.