One news headline this week had a whiff of déjà vu about it. Nuclear startup Deep Fission announced that it was going public, hoping to garner investor support to build subterranean reactors to power AI data centers.

Wait, didn’t I already write that story? I could have sworn that I did. Oh right, I did. Last September, Deep Fission said that it had gone public via a reverse merger with Surfside Acquisition, a Delaware shell company, a transaction in which a private company acquires an existing publicly listed entity to gain a stock market listing – raising $30 million in a concurrent private placement at $3 a share. Now it’s seeking $157 million in a Nasdaq IPO at $24 to $26 a share. You can see my confusion.

Turns out the previous public listing was public in name only. The reverse merger with Surfside was completed, making Deep Fission a reporting company with SEC obligations, but its stock never actually traded. The company had said it intended to list on the OTCQB, a marketplace for developing companies that don’t meet the listing requirements of major exchanges like the NYSE or Nasdaq. But searches for Deep Fission on OTCQB don’t return any results, and the company, in its S-1, denied that its stock had ever been publicly traded.

In response to questions from TechCrunch, Deep Fission declined to comment, citing the quiet period before its IPO. Deep Fission’s new public offering on Nasdaq is following the more traditional IPO route, with an offering that would value the company at up to $1.66 billion. It’s a sizable figure for a company that one year ago was struggling to raise a $15 million funding round.