Loose soil pit

A loose soil pit is an obstacle that leaders and Pikmin sink into or collapse under their weight, or can be filled with nearby loose soil.

=In fanon games=

In Pikmin 3 (Flish version)
A loose soil pit is an obstacle in Pikmin 3. They make leaving a cave by using the geyser impossible, but Umber Candypop Buds also grow nearby, and rather conveniently as Brown Pikmin are needed to pass them.