Rupert said..
I don't know if this has been posted previously but I just found it whilst looking for something else.
Could be photoshop B/S but either way it gives a perspective of size.
Couldn't find any info re who, what, when or where.....any knowledgeable people out there?
Rupert you need to explore your coastline a bit more, this type of event is fairly common at certain times of the year, at certain places.
...and yes they are huge, more so when they launch their bus like proportions clear of the surface enjoying themselves, as some would say "like being hit by a bus".