It is known from references from both the Second Punic War and the Battle of Mylae that the quadrireme had two levels of oarsmen, and was therefore lower than the quinquereme,[30] while being of about the same width (c. 5.6 m).[33] Its displacement must have been around 60 tonnes, and its carrying capacity at c. 75 marines.[33] It was especially valued for its great speed and manoeuvrability, while its relatively shallow draught. (This AU is about ships having eyes but cannot talk.)