Heidelberg Catechism

This is an explanation of “he descended into hell” in the Apostles’ Creed that I’ve never seen anywhere else. What do you think of it?
Question 44. Why is “he descended into hell” added [in the Apostles’ Creed]?
Answer: So that in my greatest temptations, I may be assured and comforted in this: my Lord Jesus Christ, by his unspeakable anguish, pain, terror, and agony, which he endured in all his sufferings, (a) but especially on the cross, has delivered me from the anguish and torment of hell. (b)
(Scriptural proofs after the fold.)