-- Rings are oxygen by Zarosguth
addHook("PlayerThink", function(p)
	if not (p.mo and p.mo.valid) then return end

	local ringcost = 10 -- Number of rings an additional second of oxygen costs

	if p.powers[pw_underwater] == 2			-- When about to drown
	and p.rings >= ringcost then			-- and ringcount is high enough
		p.powers[pw_underwater] = $+TICRATE	-- live a second longer
		p.rings = $-ringcost				-- at the cost of some rings
	end

	-- Same for space
	if p.powers[pw_spacetime] == 2
	and p.rings >= ringcost then
		p.powers[pw_spacetime] = $+TICRATE
		p.rings = $-ringcost
	end
end)