Erosion

A bomb destroyed the city above them. The subway car was knocked askew. Sections of tunnel collapsed, trapping all forty-eight unprepared, screaming passengers. Water sprayed from broken pipes. Days crept by. They burned clothes for light.
"We're a Dorothea Lange photo," Tim smirked.
Pretty Sara had a port wine stain on her face. Josh held her, sleeping. He heard the helpless prayers of others. Entombed and blanketed by radiation, human erosion's inevitable.
They decides to eat the fat ones first.