from USNI news - "Investigation: USS Fitzgerald, USS John McCain ‘Avoidable’ Collisions Due to Lapses in Basic Seamanship"
Investigation: USS Fitzgerald, USS John McCain ‘Avoidable’ Collisions Due to Lapses in Basic Seamanship - USNI News
and "Both crews did not attempt to contact the merchant ship bearing down on them, sound a warning horn, sound a collision warning or sound general quarters before the impacts."