netCDF files

Hi All,

I downloaded sentinel-3 data from and I obtained the following files:

Then I try to open the file in linux with the following command:
ncdump -h | more

However, it gives me an error as follows:
ncdump: NetCDF: Unknown file format

Did I miss something?

I do not think my netCDF has a problem as it works well with other files which are not from

Thank you very much.