All of the links appear to be dead e.g. https://oceandata.sci.gsfc.nasa.gov/cgi/getfile/S3B_OL_1_EFR____20190625T011440_20190625T011559_20190626T061032_0078_027_017_1080_LN1_O_NT_002.zip
The equivalent S3A links work ok for me.
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