Has anyone heard of this story? It hasn't got much coverage what with recent events. Poor lad.
It's strange that he went missing on Saturday and by Tuesday his father is talking about him in the past tense and guessing where his body might be found. The boy is 12, and said to be "strong" and "tough", surely there would be hope? Though it doesn't bode well that they found one shoe and his broken bike .
'A body in the water starts to sink as soon as the air in its lungs is replaced with water. Once submerged, the body stays underwater until the bacteria in the gut and chest cavity produce enough gas -- methane, hydrogen sulphide, and carbon dioxide -- to float it to the surface like a balloon.'
I don't feel the need to respond to your other suggestion