i want to acces the id from level_1

my array looks like this:

Array
(
    [id] => 85
    [id_world] => 1
    [key] => b_main
    [level] => 0
    [created_at] => -0001-11-30 00:00:00
    [updated_at] => -0001-11-30 00:00:00
    [level_1] => Array
        (
            [id] => 9
            [key] => b_main
            [created_at] => -0001-11-30 00:00:00
            [updated_at] => -0001-11-30 00:00:00
        )

    [level_2] => Array
        (
            [id] => 10
            [key] => b_main
            [created_at] => -0001-11-30 00:00:00
            [updated_at] => -0001-11-30 00:00:00
        )

    [level_3] => Array
        (
            [id] => 11
            [key] => b_main
            [created_at] => -0001-11-30 00:00:00
            [updated_at] => -0001-11-30 00:00:00
        )

)

my foreach looks like this (b is the array above):

@foreach ($a $b)
    {{ "<pre>"; print_r($b); echo "</pre>"; }}
    <tr>
        <th>
            {{{ $b['key'] }}}
        </th>
        <td>
            adsasd
        </td>
        <td>
            @{{ $b['level_1']['id'] }}
        </td>
        <td>
            adsasd
        </td>
    </tr>
@endforeach

the error i got:

Undefined index: level_1 (View: /var/www/core/app/views/asd/index.blade.php) 

so, how i can acces my id on level_1?