Debris from the Titan submersible, which imploded last week, has been returned to land. The Associated Press reports that parts of the craft, which includes a section of its white outer shell, have been returned to port in St. John’s, Newfoundland and Labrador, Canada. The debris was recovered from the ocean floor by remote operated vehicles (ROVs). ROVs were also a key part of the initial search for the missing sub. The debris is being recovered as part of the ongoing investigation into what, exactly, caused the catastrophic failure of Titan’s pressure vessel. Various outlets have asked numerous organizations for comment, but many refuse to elaborate on what is still an ongoing investigation.