The team investigates a man killed with a knife on the beach and upon reviewing the security camera footage they see Maze standing over the body in episode 3x19 "Orange Is the New Maze".
From episode 4x01 "An Exercise in Fatality".
From episode 2x06 "Return to Cadiz".
Source: I Am Not a Stalker
Senator Kelly washes up on the beach after being hit with Magneto's mutant gun.
From episode № 5695.
From episode 14x13 "90265".
From episode #209 "GILF Trip".
From episode 1x03 "In the Dark".
Arch & Vinnie at beach in episode 2x01 "A Dangerous Age".