That structure was known to local residents as a septic tank for a long time, annalex. The local historian, Catherine Corless, researched death records for that home and located 796 from infant to age 9 for which there is no record of burial. You say there is a mass grave there and evidently there must be given those records. But, if not in that structure known long and widely as a septic tank to locals that you prefer to call a crypt, then where is it? If it is in fact a crypt, then why so much resistance to admitting that the bodies of these unfortunate children who died are in it? The whole thing is bizarre, I’ve been fascinated by the gyrations of the defense for over a week. You’re merely the latest to have a go.
From the link at the Forbes' article:
‘I never used that word ‘dumped’,” Catherine Corless, a local historian in Co Galway, tells The Irish Times. “I never said to anyone that 800 bodies were dumped in a septic tank. That did not come from me at any point. They are not my words.”...
In her article she concludes that many of the children were buried in an unofficial graveyard at the rear of the former home. This small grassy space has been attended for decades by local people, who have planted roses and other flowers there, and put up a grotto in one corner.
Tuam mother and baby home: the trouble with the septic tank story
That "known to local residents" is a media hoax that you parrot.