Match your bunker release to the depth of sand
Grieve simplifies bunker play into three sand types mapped to his three releases: compact sand (squashed, little sand) plays like release one, standard-depth sand plays as release two, and deep sand (lots of sand over your shoes) needs release three. The more sand there is, the more the club must skip through, so read the sand and do not mix them up.
Channel: Dan Grieve
Watch official source at 30:52Why this context matters
Grieve stresses reading the sand with your eyes and feeling it with your feet as you walk in.