Or if he was certain they were dead, maybe call 911 and request the police. His story stinks. I also feel like most here; a parent who witnessed their child’s death does not instantly accept it. There would be shock, panic, extraordinary measures to try to revive the child. Not “oh well, let me think of a good hiding place.” I also don’t believe any typical parent would immediately worry about being blamed or tarnishing the other parent’s image. If the other parent HAD killed the child(ren), wouldn’t you want the world to know the person was a monster and guilty???
His story is completely asinine.
I think he killed the girls before SW arrived home. She may or may not have known. I suspect she looked at them via the baby monitor and she thought they were sleeping. She went to bed and he ambushed her while she was lying down or possibly asleep. This would explain why she would have trouble inflicting defensive wounds. I picture her on her stomach and him with his knee on her back. Then he bundled her up in the bottom sheet for transport. Sorry to graphic. I think he is a coward and did this all the “easiest” way he could.
I think he chose the tanks because they were in his mind already due to his job, and it saved him the work of digging, plus they must have seemed like a foolproof hiding place. I think he meant SW to go in, too, but she was unwieldy.