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The exercise deals with bathymetry data of the Dutch coast. Here is the link to browse the netcdf file of concern with your browser:
http://opendap.deltares.nl/thredds/dodsC/opendap/rijkswaterstaat/vaklodingen/vaklodingenKB118_3736.nc.html
The first link on this page (OPENDAPOPeNDAP), goes to a page the shows all the meta information and file structure of a file.
The second link (HTTPServer) can be used to download the whole file to your local hard drive.
The OPeNDAP link brings you to the following page, where the data url can be obtained:
Both in Matlab and in Python, the link to netcdf file can be specified as follows:
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