When heat rises above a certain temperature, it will close a circuit and activate an alarm. (realtormag.realtor.org)
If the only way for the heat to transfer to the rest of the ocean is convection, and heat rises in convection currents, how does the heat stay down there? (globalclimatescam.com)
Since heat rises, it is also generally warmer up high - and we know cats like it hot. (catdepot.org)