I have a GIF file of a battleship that's way too big to post, 1.27 MB, even though it's only 498x300 pixels. Don't ask me why it's not 500x300, or which ship it is, because I don't know. I think it's the USS Iowa. The muzzle blast is so great it pushes a large bowl shaped depression into the ocean under each set of guns. That's one wave you wouldn't want to surf! I used the free IrfanView graphic viewer app to extract all 17 frames from the GIF so I can post them as JPGs. Many years ago I read that when a battleship fired it's 16" guns, the whole ship moved sideways 6'. I don't know if that's true or not, but the edge of it's barely in the picture by the last frame. It looks like it moved at least that far plus rocked so it looks like it moved even farther. Wikipedia lists the weight as 48,110 long tons (48,880 t) Standard, 57,540 long tons (58,460 t) full load. That averages out to well over 100 million pounds. Think about the worst recoil of any gun you've ever fired, then try to imagine how bad the recoil must be to move a 100,000,000+ pound ship
sideways!
The first picture is the Iowa firing a full broadside of nine 16-inch/50-caliber and six 5-inch/38 cal guns. If the 16" guns are 50 calibers long, that means they're 800", or 66'8" long. I heard that when they clean the barrels, a guy with a mop goes in. No wonder they're called swabbies.
One of my platoon sergeants said that when he was in Vietnam, you could see the shells flying overhead and they looked as big as Volkswagen Beetles. Even though they were "only" 16" in diameter, the shells actually weighed more than car!
https://www.irfanview.com/ https://en.wikipedia.org/wiki/USS_Iowa_(BB-61)