How badly would a Halifax- or Montgomery-scale explosion at Kiel have hurt Germany's ability to wage war?
Short answerIt could have crippled a concentrated cluster of submarine, ship, and possibly armored-vehicle production, making Kiel a major strategic target.
NotesThis industrial counterfactual concerns an explosion that did not occur. Kiel concentrated a large share of German submarine and ship production. Given the port's geography and connected industry, a catastrophic harbor explosion might also have disrupted manufacturing that supported armored vehicles and other war matériel. That concentration made Kiel an obvious strategic-bombing target and, in a hypothetical war extended long enough for earlier atomic weapons, a plausible nuclear target. Industrial geography can turn one naval base into a vulnerability extending far beyond the ships alongside its quays.