Olympic-class ocean liner of 29 coal-fired steam boilers in six compartments. However, "Olympic"s boilers were adapted for firing by oil at the end of the First World War, which reduced the number of engine crew required from 350 to 60. The "Olympic"-class ships were long, displacing normally (their draft at this displacement being ), and their tonnage was around 45-46,000 GRT. "Olympic" became the largest ship in the world when it was completed in May, 1911 before losing the title to its sister "Titanic" when she was completed in April, 1912. After the loss of "Titanic" the third sister ship "Britannic" claimed the
Athenian sacred ships vessel was constantly repaired by replacing individual planks to keep it seaworthy while maintaining its identity as the same ship. (For the philosophical question of the ship's identity, see Ship of Theseus.) After the reforms of Cleisthenes, a ship was named for each of the ten tribes that political leader had created; these ships may also have been sacred ships. The "Paralus" and the "Salaminia", and possibly some other sacred ships, served in the Athenian combat fleet. Those two vessels, being particularly swift, were used as scout and messenger ships, but also fought in the line of battle. The "Paralus"