Two kinds of ship
Greek vessels fall into two broad groups, with different shapes and different jobs. Warships were long, narrow and driven mainly by oars, built for speed and ramming. Merchant ships were deeper, broader and sail-driven, built to carry cargo. Many of the details come from a mix of ancient texts, vase paintings, reliefs and a small number of excavated wrecks, so some points remain uncertain.
The trireme
The trireme was the main warship of the classical Greek world, famous from the fifth century BCE. The name refers to its three levels of oarsmen. According to the traditional reading of sources, a crew of about 170 rowers sat in three tiers, with 62 in the top group, 54 in the middle and 54 in the bottom, plus officers, deck crew and a small number of fighting men. The ship was roughly 35 to 40 metres long and only around 5 metres wide, which is why it was fast but unsuitable for long open-sea passages.
How exactly the rowers were arranged has been debated for centuries. A full-size reconstruction named Olympias, built in Greece in the 1980s, tested a reading in which the oarsmen sat staggered on three levels, and it showed that such an arrangement could work. Reconstructions are not proof of the original, but they help limit the possibilities.
The ram and the hull
The weapon of the trireme was a bronze ram fixed at the waterline of the bow. A ram found in the sea off Athlit in Israel, thought to belong to a warship of the Hellenistic period, is the best-known surviving example, and it shows how the ram was fitted on a heavy timber structure at the front. The aim was to strike a hole in an enemy ship’s side, so the narrow, light hull and the trained crew were as important as the ram itself. The use of such tactics at the Battle of Salamis is discussed in its own article.
Warships were generally built shell-first, with the planking joined by mortise-and-tenon joints and the frames added afterwards, though evidence for the exact details is limited because no complete trireme has been found. The hull was kept light, and it was often drawn onto a beach at night rather than left in the water, as the timber could become waterlogged. A rope truss, running along the hull, helped prevent it from sagging at the ends.
Merchant hulls
Merchant ships were a different design. They were broader, with rounded hulls and a single mast with a large square sail, and they relied mostly on wind, though a few oars could assist in harbours. The Kyrenia ship, a vessel of roughly the late fourth century BCE found off the north coast of Cyprus, is the most famous example. It was about 14 metres long, built of Aleppo pine, and the hull was held together with closely spaced mortise-and-tenon joints, fastened with pegs. Copper nails fixed the frames, and the lower hull appears to have been protected by a layer of lead sheathing.
This is the mortise-and-tenon shell-first form, and it is a good example of the wider move described in the overview of ancient shipbuilding methods. Other wrecks, such as the one known as Ma’agan Mikhael off the Israeli coast, from about the fifth century BCE, show a similar approach. Together they suggest a standard way of building across the eastern Mediterranean.
Keel and shape
Greek hulls had a keel, a central timber along the bottom, which gave the structure a backbone and a base for the stem and stern posts. The keel and the lower planks were usually thick, with thinner planking higher up. Steering was by a pair of large oars at the stern, one on each side, rather than a rudder on the centreline.
The shape of the hull reflected its purpose. The trireme’s low, narrow profile made it fast under oars; the merchant ship’s belly was designed to carry as much cargo as possible while remaining stable. Merchant ships also carried a distinctive cargo: amphorae, the clay jars used for wine and oil, stacked in layers in the hold. The cargo of such vessels is part of the story of Greek merchant fleets.
What wrecks reveal
Excavated wrecks provide the most reliable information. Careful recording of hull remains, fastenings, wood species and cargo allows archaeologists to reconstruct how a ship was built, where it came from and where it might have been heading. Much of this work belongs to the field of maritime archaeology, which has developed techniques for recording and conserving waterlogged timber.
Wrecks are also biased. They tend to be merchant ships that sank, because warships were usually repaired or broken up, and they are often found in places where the sea floor preserves wood. As a result, the picture of merchant ships is far more detailed than that of warships, and the trireme design is known indirectly, from texts and images, plus the Athlit ram and the partial remains of ship sheds at Piraeus.
Later changes
Greek ship design did not stop in the classical period. Hellenistic rulers built very large warships with more rowers per oar, and the Romans took up and adapted Greek and Carthaginian designs. Over time, as the earlier article on hull evolution explains, the Mediterranean shell-first tradition gave way to frame-first building. The trireme itself passed from use well before that, replaced in many fleets by larger, heavier ships.