not quite admitted to ~ within 75 years ~ more like 25 years ~ check Peregrine soliton at http://www.nature.com/nphys/journal/v6/n10/abs/nphys1740.html or read the cute story about the Lego pirate in a fishtank at http://www.tgdaily.com/general-sciences-features/62516-lego-pirate-proves-existence-of-super-rogue-waves. I have to study that one a bit more because it suggests the existence of even bigger waves than anyone had thought possible. This stuff all derives from quantum expressions ~ not from ordinary hydraulic formulae.
I don’t mean to argue, but I feel obligated to correct you. A US Navy vessel famously took the first credible measurement of a rogue wave in 1933. They were noted for centuries earlier, however.