Port and starboard vessel's starboard side by green and its port side by red. Aircraft are lit in the same way. Port and starboard Port and starboard are nautical and aeronautical terms of orientation that deal unambiguously with the structure of vessels and aircraft. Their structures are largely bilaterally symmetrical, meaning they have mirror-image left and right halves if divided long-ways down the middle. One asymmetric feature is that on aircraft and ships where access is at the side, this access is usually only provided on the port side. To understand which is which, when a person is facing the bow on a
Sinking of the RMS Lusitania in boiler room no. 1, but rather in the high-pressure steam lines to the turbines. The original torpedo damage alone, striking the ship on the starboard coal bunker of boiler room no. 1, would probably have sunk the ship without a second explosion. This first blast was enough to cause, on its own, serious off-centre flooding, although the sinking would possibly have been slower. The deficiencies of the ship's original watertight bulkhead design exacerbated the situation, as did the many portholes which had been left open for ventilation. The wreck of "Lusitania" lies on her starboard side at an approximately