Originally Mike thought only his garage and a small portion of the house needed to be torn down and rebuilt. However, it has now been determined that the entire house must be torn down. 
Mike has been able to recover data from the disks in one of the computers from the garage that was near floor level (lower than my machine), but the drive from the machine that was next to mine will not spin up. Fortunately the disks he did recover have backups of his most important data. Some of the backup data is months old, but for much of the data that’s new enough.