hey i found the sunken ruins hard to so heres how ya do it
u use the invisiblity gadget thats next 2 the green acid pool to b able to swim thro dat.
but make sure you have activated the horn dive switch first !!!!
youl see as u r swimming brighter green light so swim up thro it 2 the next room. Just keep activating the switches and going back and 4wards between the 2 rooms to activate those.
I figured the other stuff b4 that was easyish so I didnt need ta tell u bout dat