An underwater robotics specialist is revealing a “shipwreck city” hiding beneath a lake in a major West Coast hub — and much of it remains a mystery. Remotely operated vehicle (ROV) specialist Phil Parisi is working to  verify and document  nearly 100 “targets” in Lake Union, a central lake in Seattle , Washington. The urban lake has served as a working waterway for over a century, supporting shipbuilding and vessel traffic in the Emerald City. The expert told KING 5 that about half of those sites, which were previously mapped but not visually confirmed, are believed to be shipwrecks — and not all of them have been explored by divers. To bridge that gap, Parisi uses ROVs to document targets identified in sonar surveys. “We need to document what these wrecks look like today,” Parisi told KING 5. Remotely operated vehicle (ROV) specialist Phil Parisi is working to verify and document nearly 100 “targets” in Lake Union, a central lake in Seattle, Washington.…