You can’t walk up to the glacier face because of the melt lake (unlike the Franz Josef).  So tourist boats take you.  The face looks tiny in context of the whole valley, but shows it’s size when seen next to a tourist boat.

The glacial face walls drop into the lake, but underwater is a ledge sticking out about 60m.  Icebergs break off from this and suddenly pop up to the surface causing a certain amount of consternation on the boats.