I tried to solve this after copying/pasting with the top line of air missing. It was very hard.
For the real puzzle I came up with two (bug) solutions:
:solution.2=dig&(5,5);(7,3);2;block;4;(7,5);4;bridge;4;(7,5);dig;(8,5);3;bridge█(8,5);4;bridge;(8,6);6
:solution.3=dig&block&(3,5);dig&(7,3);bridge;6;(7,5);dig&(8,5);2;(8,4);bridge&(8,5);9
For the puzzle with the top row of air missing I came up with:
# #
# #
r # #
######## MMM
#*NNNNN#bAO
############
:*=tN
:author_name=colonelfazackerley
:author_url=github.com/colonelfazackerley
:block=9
:bridge=9
:description=The rabbots live beneath
:dig=9
:explode=9
:music=tryad-witness
:name=Underworld
:num_rabbits=0
:solution.1.code=|]^y^N^,|bN^p)N^^+i)r)rq/lQQCC|{y^cLW^8b
:n=1,5,1536
:n=2,5,1536
:n=3,5,1536
:n=4,5,1536
:n=5,5,1536
:n=6,5,1536
(Encoded solution in case anyone wants to try it)