Collins had to pilot the shuttle through a 360 degree flip while flying beneath the International Space Station. It allowed colleagues on the orbiting lab to photograph the craft's underside and check if the heatshield had been breached.
Over the years, they’ve also refined their training practices, which has ultimately led to more developers joining both projects.
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However, the TaxPayers' Alliance has branded it a waste of money and the Covid-19 Bereaved Families for Justice UK said while the work being done was vital, public inquiries generally needed to become more efficient and less adversarial.