People pardoned our hazy lack of details through realisation of the shock the sad event must have caused us, and believed us when we explained that the mangling action of the wind had rendered all eleven bodies unsuitable for transportation outside. Indeed, I flatter myself that even in the midst of our distress, utter bewilderment, and soul-clutching horror, we scarcely went beyond the truth in any specific instance. The tremendous significance lies in what we dared not tell—what I would not tell now but for the need of warning others off from nameless terrors.
I don't get the phrase "tremendous significance" here. It feels like there's something missing in this sentence, making the meaning hard to get, but I can't quite put my finger on what exactly is wrong with it. Maybe it should have been "tremendous significance of "?
Could someone help me please?
Source: https://www.hplovecraft.com/writings/texts/fiction/mm.aspx