Slokam 6

The roar of the Varaha is said to have been heard in Janaloka, Tapaloka and Satyaloka. 

The purport of the lokas have been addressed in prior slokams. The different lokams represent the different realms of conscious states of existence.  The inhabitants have different durations of lives.  The impact of the destructive forces, that would destroy, for example, the inhabitants of Bhuloka (Earth), would not impact the residents of Tapaloka. The residents of Tapaloka would know that there is a destructive force sweeping earth, but would not be physically impacted.  The residents of the higher lokas,  gradually transcend from a physical to an ethereal state of existence, that does not have attachments or dependencies. Once the attachments and dependencies are gradually cast away, eternity and tranquility set in.

Some definitions from the web are provided below. SB 3.25.37, Purport:

The vibhūti, or opulences, offered by māyā are of many varieties. We have experience of different varieties of material enjoyment even on this planet, but if one is able to promote himself to higher planets like Candraloka, the sun or, still higher, Maharloka, Janaloka and Tapoloka, or even ultimately the highest planet, which is inhabited by Brahmā and is called Satyaloka, there are immense possibilities for material enjoyment. For example, the duration of life on higher planets is far, far greater than on this planet. It is said that on the moon the duration of life is such that our six months are equal to one day. We cannot even imagine the duration of life on the highest planet. It is stated in Bhagavad-gītā that Brahmā's twelve hours are inconceivable even to our mathematicians. These are all descriptions of the external energy of the Lord, or māyā. Besides these, there are other opulences which the yogīs can achieve by their mystic power.

SB Canto 3  SB 3.10.9, Purport:

These pratibimba living entities, as parts and parcels of the Supreme Lord, have inherited different proportions of His original qualities, and in terms of their inheritance of these qualities, they appear as different species of life and are accommodated in different planets according to the plan of Brahmā. Brahmā is the creator of the three worlds, namely the lower planets, called the Pātālalokas, the middle planets, called the Bhūrlokas, and the upper planets, called the Svarlokas. Still higher planets, such as Maharloka, Tapoloka, Satyaloka and Brahmaloka, do not dissolve in the devastating water. This is because of the causeless devotional service rendered unto the Lord by their inhabitants, whose existence continues up to the end of dvi-parārdha time, when they are generally liberated from the chain of birth and death in the material world.

Jana loka is a term used in yogic and Hindu philosophy to describe the third highest plane of consciousness or the heavenly realm. The term comes from the Sanskrit jana, meaning “common person” or “living being," and loka, meaning “world,” “realm” or “plane of existence.” The number of lokas varies by tradition.

Tapoloka means those who have performed here severe penances, and they are transferred there in Tapoloka. In Tapoloka, when there is destruction, annihilation of this material world, in the Tapoloka there is no destruction.

Satyaloka is the highest of the lokams. It is the abode of Brahma.  There are no conflicts in Satyalokam.

The sages in the different lokams welcome and applaud the arrival of the Paramathma to dissipate the adharma on Earth (bhuloka). They sang the hymns to indicate solidarity and support. 

The slokam says that, encouraged by the welcome,  the Paramathma enters the waters to retrieve the vedas.