The Lenormant Relief, from the Athenian Acropolis, depicting the rowers of an aphract Athenian trireme, ca. 410 BC. Found in 1852, it is one of the main pictorial testaments to the layout of the trireme.
Source: https://en.wikipedia.org/wiki/Trireme
This is the later type of aphract trierem. This design had light decking over oarsmen's heads and was used by all nationalities from around 580BC (http://www.rodlangton.com/ancient/desc.htm ).
It is noteworthy that the rowers of the Athenian navy were typically not slaves, but free citizens from the lower classes. Their decisive role in the naval might of Athens and above all in the victory of Salamis gave them prestige and self-confidence with very important political consequences, resulting in the further democratization of the Athenian Constitution.