moorings of the mountains

"Out of the belly of Sheol I cried,
And you heard my voice.
For You cast me into the deep,
Into the heart of the seas,
And the floods surrounded me;
All Your billows and Your waves passed over me.
Then I said,'I have been cast out of Your sight;
Yet I will look again toward Your holy temple.'
The waters surrounded me, even to my soul;
The deep closed around me;
Weeds were wrapped around my head.
I went down to the moorings of the mountains;
The earth with its bars closed behind me forever;
Yet You have brought up my life from the pit,