Iron Skull Sub Attack

LEGO 76048 Iron Skull Sub Attack was a 335 piece Marvel Super Heroes set with 4 minifigs released in 2016. It features the Iron Skull Sub with 4 stud shooters, a cage on a chain, and an opening cockpit, alongside 4 minifigures: Scuba Iron Man, Scuba Captain America, Iron Skull, and a Hydra diver with an underwater jet. The set is based on the Marvel animated series and comic book Avengers Assemble. It was retired in February 2017 with a lifespan of 13 months.

Description via Its a Block Party