Swami Sivananda Saraswati - Says in hatha yoga when one collects all of his prana using either lambika yoga/khechari mudra and focuses it in his eyebrow center he goes into jada samadhi. This is more of an acrobatic feat of being buried under ground as breathless state is achieved and being in a hibernation or jada(inert) state where no knowledge of the supreme or transformation of the mind occurs.
There is this art of yoga called siddha vithai in south India where people practice Vaasi yoga and go into jeeva samadhi as it is being called. A state where complete breathlessness is achieved and the individual is called a Gnani and a jeevan mukta and is buried underground and considered immortal.
The definition of the two seem very similar. Jada state should be avoided but how do you know what vaasi or lambika actually leads to?