in the event of moon disaster

[busker]

in the event of moon disaster

One     splitting tension    creates a
Small disturbance in the fore-
Step of giants
For sinkholes are only as large as the 
Man who dives down into them  

One distant dust speckle,
Giant to its beloved leeches, they 
Leap from vein to vein,
For from the marrow of 
Mankind do they suckle 




*The title of this poem is pulled from the header of a 1969 speech prepared in the event that the Apollo 11 crew did not return from their lunar mission.* 

I think the metaphor lost its way towards the end, from dust speckles to veins and from leeches feeding on blood to sucking on marrow.
I'm also not sure about what you mean by sinkholes being as large as the diver. It can make sense if sinkholes are a metaphor for something else, because it obviously doesn't make sense literally, and there's something lost in that abstraction. I come away from it initially pleased, but then I wonder what the heck I just read.