One person falling into a cesspool by accident and dying, yes.
A second falling victim when attempting to save the first, yes, very possible.
But six? No. Gotta be some special way to murder for a specific islamic crime.
They could have all been standing on top of the cesspool, maybe doing that dance with the hands up in the air while stomp and jump around to tambourine and drums, when...hoooly crap! The damn thing collapsed.
Must have been deep and people do panic so they probably drowned each other, each trying to keep their head above the . . .
shitty way to go
They could have been trying to save one another in sequence and been overcome by methane.
Probably hydrogen sulfide gas. That’s the “sewer gas” you have probably gotten an occasional whiff of from a nearby sewer line or vent. Sort of a rotten egg odor. It will quickly kill you in any sort of confined space.
https://en.wikipedia.org/wiki/Hydrogen_sulfide
Yeah I was wondering myself how 6 people managed to fall into a cesspool.