People visit a reconstruction of a Hellenic naval trireme named "Olympias" in Piraeus, largest port of Athens, Greece, on June 5, 2018. It is displayed as an open museum for public till June 9, 2018. Trireme is an ancient type of galley commonly used by the maritime civilizations of the Mediterranean. (Xinhua/Marios Lolos)

People visit a reconstruction of a Hellenic naval trireme named "Olympias" in Piraeus, largest port of Athens, Greece, on June 5, 2018. It is displayed as an open museum for public till June 9, 2018. Trireme is an ancient type of galley commonly used by the maritime civilizations of the Mediterranean. (Xinhua/Marios Lolos)

People visit a reconstruction of a Hellenic naval trireme named "Olympias" in Piraeus, largest port of Athens, Greece, on June 5, 2018. It is displayed as an open museum for public till June 9, 2018. Trireme is an ancient type of galley commonly used by the maritime civilizations of the Mediterranean. (Xinhua/Marios Lolos)

People visit a reconstruction of a Hellenic naval trireme named "Olympias" in Piraeus, largest port of Athens, Greece, on June 5, 2018. It is displayed as an open museum for public till June 9, 2018. Trireme is an ancient type of galley commonly used by the maritime civilizations of the Mediterranean. (Xinhua/Marios Lolos)