It is written very briefly here, but it is important to log into the dahu cluster from the ssh gateway with

yourlogin@rotule:~$ ssh dahu

or

yourlogin@trinity:~$ ssh dahu

which is a little different from the syntax for froggy as outlined in the GRICAD documentation

Also, I think scp -r your_login@dahu.ciment:/your_folder /folder_on_your_computer (section 7)) needs a space between the server directory and the local target directory! - from someone who has never used scp

11.pdfessay

write12.pdf

essays13.pdf

Bad internship place, bad advisor...switch to somewhere else for the sake of your sanity.