NOACH – CHESSED
Noach 6.14 תעשה את התיבה
The רוקח points out that the word את usually adds an associated subject to the main one being doscussed and therefore, here it is icluding either an additional board upon which Og or perhaps the giant Re'eim were seated upon. He offers another pshatt that seems astounding. An additional small Teivah was build to tag along the "Mothership" and it stored extra food if needed.
What?
It is interesting to note that את התיבה is mentioned only once more when the ark first rose up upon the water. However it is not mentioned again. It seems perhaps that it didn't even make it through the flood. So what was the point of this additional small teivah?
In Birchas Hamazon we say that Hashem gives בחן ובחסד - One was Noach's midah - to give what is needed with grace - "service with a smile". The other was Avraham's midah, to offer more than necessary.
Perhaps the first instructions from Hashem to Noach was an exercise in Avraham's midah - Chessed. As much food as was brought into the teivah, either it was minimal (as the Gra explains אשר יאכל to mean just one כדי שביעה and it miraculously sufficed) or all that was needed crammed in. Both of these left no room for extras. But as a midah of chessed, when only "enough" is presented, the recipient feels uncomfortable to take. But when an overflowing platter of extra food is offered, then the guest is comfortable to take as much as he would like.
The only way to exercise this type of giving was to purposefully designate a whole extra unit for extras. This was the purpose of the additional teivah - an act of overflowing chessed to allow all the guests in the teivah to feel comfortable to eat, knowing there are extra reserves and nothing to be concerned about. So once they saw this extra storage at the beginning of the mabul, there really was no need for it to survive the flood.