context: During the First World War, Plymouth was the port of entry for many troops from around the Empire and also developed as a facility for the manufacture of munitions. Although major units of the Royal Navy moved to the safety of Scapa Flow, Devonport was an important base for escort vessels and repairs. Flying boats operated from Mount Batten.
question: మొదటి ప్రపంచ యుద్ధం సమయంలో రాయల్ నావికాదళం యొక్క ప్రధాన స్థావరం ఏమిటి?
answers: Scapa Flow