The suspects have been identified as Chad Andrew Elwartowski, an American bitcoin investor, and his Thai girlfriend, Supranee Thepdet (aka Nadia Summergirl). Authorities have accused them of several laws violation, including taking action that diminish Thailand's sovereignty. Seasteading is the concept of creating permanent dwellings at sea, outside the territory claimed by any government. Police say they have prepared sufficient evidence ready and arrest warrants for the couple should be issued soon. The office's representatives are necessary because the alleged crime took place outside Thailand's territory.
Source: The Nation Bangkok April 23, 2019 12:22 UTC