Even though light is the fastest thing on earth, it cannot traverse through these dimensions in an entire lifetime. Only thoughts can take us to these dimensions.

The dimensions below earth are Atala, Vitala, Sutala, Talatal, Mahatala, Rasatala, Paatala, which we should just read and forget. These are for those beings who live a life devoid of service and charity, full of selfishness—in other words, a life of darkness. This includes beings who harm others or even after being in a position of preventing pain of others, look the other way. These souls are sent to these lower lokas to go through the processes of cleansing through pain, fear, claustrophobia and stickiness with slime. The lower worlds are dark as the occupants of these lokas desire only darkness. The forms taken by the souls in these dimensions are gross, slimy, painful and full of pure fear all the time.