A co-founder of Hyperloop One paid his girlfriend as much as $40,000 a month for public relations services at one of his companies, a fiery new lawsuit alleges.

Hyperloop One paid about $400,000 for PR services between January 2015 and March 2016 to a woman who was the girlfriend of Shervin Pishevar, managing director of Sherpa Capital and co-founder and executive chairman of Hyperloop One, the lawsuit said. The payments started at $15,000 per month and reached as high as $40,000 per month, the lawsuit complains, "far above market value."