Virtual Yggdrasil

The Fleet Of Stars, 4.

When the L-5 colony disbanded, the Tree, a giant sequoia grown in low gravity, was allowed to die. Although the space station has been moved from its L-5 orbit to Lunar orbit and repopulated, no second Tree has been planted in it. 

Fenn has had virtual reality experiences of that Tree and also of Yggdrasil:

roots in earth, winterland and hell;

trunk soaring into heaven;

nine worlds strewn through windy, shadowy leafage;

the All-Tree whose fall brings divine doom and the end of time;

the wind in its boughs had told him something deep but unknown.

Once again, the wind speaks. 

 

Everyone retells myths. I did not know that Yggdrasil was meant to fall at the Ragnarok. If anything, the World Ash Tree seems to be absent from accounts of Ragnarok although I also though that Lif and Lifthrasir were said to have hidden among its branches. See Hoddmimis Holt.