Aut cum scuto aut in scuto
Yes, the Brits have strange ideas but it looks as if that one held a torpedo - which makes it even stranger.
Torpedoes AND depth charges. And, it's a turboprop. Actually an interesting solution for how to do a sub Hunter on a small carrier just after World War II. Sure looks weird and ugly though. FormerFlyer
Contra rotating props, I bet the first time one landed on a Brit carrier, the maint guys went "You got to be kidding us!"