deepest grave of matrimonial silence


Senior Member
Here are some words from the novel Lady Chatterley's Lover(page 395, chapter 17) by DH Lawrence (planetebook,here):
(background: Mellors' wife Bertha was gossiping about Mellors and other women..……" )

The woman(Bertha) has blown off an amazing quantity of poison-gas. She has aired in detail all those incidents of her conjugal life which are usually buried down in the deepest grave of matrimonial silence, between married couples. Having chosen to exhume them, after ten years of burial, she has a weird array.

How should I understand the deepest grave of matrimonial silence please?
It seems to me that by grave and silence, Clifford was trying to tell readers something profound about marriage
Thank you in advance
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