The ship says
Πάσιν ημίν κατθανείν οφείλεται
This is Greek for "Death is a debt which every one of us must pay", a quote from Euripides' play Alcestis.
And the hat features a quote from Homer's Iliad:
...Ύπνω και Θανάτω διδυμάοσιν.
"...of Sleep and Death, who are twin brothers." This refers to the fraternal relationship of the respective deieties, Hypnos and Thanatos.
