Wget downloads folder structure but no files

I'm trying to download all .nc files from this website:

https://data.seaice.uni-bremen.de/MultiYearIce/ascat-amsr2/final/Antarctic/netcdf/2021/

Using:

wget -m https://data.seaice.uni-bremen.de/MultiYearIce/ascat-amsr2/final/Antarctic/netcdf/2021 -P /scratch/robbie/mels_ice_type

I've also tried with a bunch of flags, like adding: -A * -pk -e robots=off before the https argument.

Unfortunately wget downloads the folder structure and index files but not the .nc files.

What tool would be appropriate to do this, or how can I use wget to accomplish this?