Scheveningen has really heavy conditions when wind / swell is strong.
I was on my way to Scheveningen Monday, but returned home midway after re-checking conditions (wind forecast, measured wind, wave forecast at surfline, livecams). It was very obvious that the conditions were really really demanding.
So be careful when you plan to go there in strong conditions.
Anyway, it is terrible that people died, so sad. Unbelievable that they were experienced and super trained locals.
The strong foam formation is a result of over-fertilization which is mainly caused by the European farmers. The intense production of pigs / cattle produces massive amounts of manure, which is poured on the fields as a fertilizer. Sooner or later this ends up in our rivers and oceans. Congrats! We want cheap meat, and we get it