You see that one ship out on the horizon,
 and feel that unique tang of loneliness.
  There's far, far too much blank sea to thrive in,
   and all the makings for keen ghostliness.

That boat will soon be passing beyond sight,
 and maybe it will falter, maybe sink.
  The sea has created a million plights,
   and hazards there will honor no strict brinks.

In Shakespeare, ships are lost, often as not.
 See: "Tempest," "Merchant," "Pericles,” and so on. 
  Perhaps, you'll say that today isn't so fraught
   with maritime menace and sea demons.

Why more vexed than those who keep ships running?
 'Cause sailors will never, ever, see it coming.