How to see output of invoke expression - IO.MemoryStream

Question

$s=New-Object IO.MemoryStream(,[Convert]::FromBase64String("some base64 string here"));

IEX( New-Object IO.StreamReader(
        New-Object IO.Compression.GzipStream(
           $s,[IO.Compression.CompressionMode]::Decompress) 
)).ReadToEnd();

How can I see the IEX's output?