Surfacing and firing your deck gun at her and hoping some kind of weird combination of luck and spontanous space-time warps would allow your 4" shells to penetrate the 9.1" Deck Armor and detonate her magazines?
I've actually done this.. was running on the surface one day in heavy fog with radar shut down, dove to PD to check sonar. sonar operator goes crazy, so i activate radar and there not 700 yards 20 degrees of port bow is a big BB, so i close until i can finally see her (around 250 yards, this was thick stuff) and just say well screw it and open up with the 4". Weirdly, a combination of 4" AP/HE, 20mm AP and 40mm APs on the same spot (in between the front two turrets) blew her mags and sent her to the bottom.. however it did take 70 shells and all my AA ammunition
Krauter
P.S the AA ammunition could have been used, while en route to one of the resupply bases in the Solomens i ran into Betties

.. bastards bombed the crap out of me as i dove and as i hit 150' i hear the bulkheads go..