addHook("MobjThinker", function(mobj)
	local player = mobj.player
	local swimming = 0

		if swimming == 0 & (player.pflags & PF_JUMPED) & (player.cmd.buttons & BT_USE)
			swimming = 1
			end

		if not player.powers[pw_underwater]
			and not player.powers[pw_super]
			swimming = 0
			end

		if (player.powers[pw_underwater] | player.powers[pw_super]) & swimming == 1
		and (player.cmd.buttons & BT_JUMP)
			and not (player.pflags & PF_NIGHTSMODE)
			and not (player.pflags & PF_ROPEHANG)
			and not (player.pflags & PF_MACESPIN)
			and not (player.pflags & PF_STASIS)
			and not (player.mo.tracer and player.mo.tracer.type == MT_TUBEWAYPOINT)
				//move up if jump is pressed
				P_SetObjectMomZ(player.mo, FRACUNIT*8, false)
			end

		if (player.powers[pw_underwater] | player.powers[pw_super]) & swimming == 1
		and (player.cmd.buttons & BT_USE)
			and not (player.pflags & PF_NIGHTSMODE)
			and not (player.pflags & PF_ROPEHANG)
			and not (player.pflags & PF_MACESPIN)
			and not (player.pflags & PF_STASIS)
			and not (player.mo.tracer and player.mo.tracer.type == MT_TUBEWAYPOINT)
				// move down if spin is pressed
				P_SetObjectMomZ(player.mo, FRACUNIT*-8, false)
			end

		if (player.powers[pw_underwater] | player.powers[pw_super]) & swimming == 1
		and not (player.cmd.buttons & (BT_JUMP|BT_USE))
			and not (player.pflags & PF_NIGHTSMODE)
			and not (player.pflags & PF_ROPEHANG)
			and not (player.pflags & PF_MACESPIN)
			and not (player.pflags & PF_STASIS)
			and not (player.mo.tracer and player.mo.tracer.type == MT_TUBEWAYPOINT)
				// kill z momentum when not moving up or down
				player.mo.momz = 0
			end

end, MT_PLAYER)