Olympias is a reconstruction of an ancient Athenian trireme and an important example of experimental archaeology. It is also a commissioned ship in the Hellenic Navy of Greece, the only commissioned vessel of its kind in any of the world's navies.

A naval ram is a weapon fitted to varied types of ships, dating back to antiquity. The weapon comprised an underwater prolongation of the bow of the ship to form an armoured beak, usually between 2 and 4 meters (6–12 ft) in length. This would be driven into the hull of an enemy ship to puncture, sink or disable it.