"Mud Boat"

Phrase used by Kazuyuki Fujita to describe Noah, it has two possible meanings;

1. An easy to sink ship made from mud, it mat also be from a parable about something that is likely to go away soon.

2. Kabuki reference. Kabuki is traditional Japanese theater, in which the stage is very spartan. A box with mud in it was used to represent a pond, lake, rice paddy etc.