Found this

Neat pics.
Armor test-shots on a Sherman Differential Housing for the M4A3E2 "Jumbo"- 1944. Only about 258 of these heavily armored "Assault Tanks" were produced, but they were fitted with armor almost identical in thickness to the famous German Tiger I! The downside was the much heavier armor was very hard on the suspension.

What they don't say is how much splinter or bisuits were sent flying around inside the hull from near penetrations and the 90mm full ones.
The term biscuit comes from the naval jargon on when a 16" or similar sized shell penetrates armour just prior to full penetration a large section of inner armour is usually sheared out of the plate this then allows full penetration of the projie.
You can imagine the size of this biscuit that goes bouncing around inside causing carnage before all is snuffed out with the detonation of the round, in one of my naval books on these big Naval rifles (Yes thats Navy talk for them), the brits calced out a 15-16" shell had a striking force of @80,000 foot tons. There is a piece of Yamato armour plate that is 26" thick that has been penetrated by a USA Naval 16" A.P shell.
You can see the size of the biscuit that has been shorn off the inside as the pic shows.

What HESH rounds were designed to cause IIRC: "spalling" without the penetration. A way to get superior performance from lighter and lower velocity guns.