It was not long into the night when this post is being written.
The origin of water on Earth has not been clarified, and impacts from outer space is one of the possible reasons that might have brought water to the world's oceans. After cooling of the primordial Earth and had form a crust layer when became stratified on the surface, other process of collection water as oceans are also possible reason.
Singular vortex mechanism is merely offering an alternative theory for Tunguska event that is very comprehensible as a more likely cause, can provide as a platform sound for further investigation, there is no concrete proof as yet to ascertain. No need to rule out the exploding comet in mid air theory while contemplating another likely possibility.
Another important point to ponder for Tunguska event; an orbiting comet should be rotating cyclonic ally in counter-clockwise direction as a result of
cyclical gravity field effect of Sun based on UVS, and on entering northern hemisphere of Earth and then subjected to its cyclonical gravity field effect on closer range, the rotation in counter-clockwise direction should be intensified. A comet exploded in mid air with bow shock waves conserving the angular momentum of comet rotation should cause the forest fall to rotate in counter-clockwise direction. Therefore, cyclonical rotation of molten matter vortex underneath Earth's crust in a counter-clockwise drag and twirl on land mass would cause forest fall of trees to vortically collapse in clockwise direction within a meandering perimeter is a more logical explanation.
While contemplating on above, was pondering on
rotating direction of Venus, this is the only planet in solar system that has described to be rotating in clockwise direction when viewed from a fixed reference frame, which does not seem to conform to cyclonical gravity field effect of Sun for rotation direction of a naturally formed revolving planet, and then in a spark was awakened to an idea

that this is a paradoxical illusion!
The planetary rotation direction in solar system is officially referenced to an external frame on the ecliptic plane of Sun, from this external perspective for a planet cyclonically rotating at a speed faster than its revolving speed, there is no issue. However, if a planet is rotating cyclonically in CCW direction at a speed slower than the revolving speed also in CCW direction, from the external perspective the planet would be deemed as rotating in clockwise direction. Whereas a tidally locked planet is considered to be in sync on rotating and revolving speed, the tidally locked planet is actually not rotating at all from the centralized point of view. (such as moon when is viewed from Earth is actually not rotating at all, while its rotation speed is in sync with its revolving speed around Earth when referenced from an external perspective.)
Venus therefore is actually cyclonically rotating in CCW direction from a perspective referenced from the Sun, it is paradoxically rotating in CW direction from the external perspective, this is as a result of its CCW rotating speed is slower than the CCW revolving speed, rendering the optical illusion. Oh man! this is making a debut statement;

cheers!
Thanks to your inquiry that has triggered the idea and henceforth has understood the paradoxical effect for a clockwise rotating Venus.