(Update: Addressed parent's concerns about "staying intact.")

Represent the subarrays as references to arrays. Depending on what you mean by "stay intact while loaded in the hash," you'll either want to copy or "alias" the original array's contents:

    $hash{'filename'} = [ @array ];  # copies array
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Or:

    $hash{'filename'} = \@array;     # "aliases" array
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Then you can access it like ususal:

    $hash{'filename'}[0]; $hash{'filename'}[1];
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See perlref and perllol for more on this kind of thing.

Cheers,
Tom