Charles H. Spurgeon on Psalms 86:13

Hell is put metaphorically for great and extreme dangers, or miseries which seem irrecoverable and remediless; these are figuratively called hell, because hell, properly taken, is a place from whence there is no recovery. There's no release from the chains of darkness: all changes are on earth; heaven and hell know none. When David praises the Lord for delivering his soul from the lowest hell, he meaneth an estate on earth of the lowest and deepest danger imaginable: mercy helped him at the worst. To be as low as hell, is to be at the lowest. —Joseph Caryl.