Sometimes a scale model will help to understand the feasibility of the "life saving" Ark built by Noah for the preservation of mankind and the animals that God brought to him.

This is an “N-scale” (1:160) model of Noah’s Ark, built by Lynn, and is representative of the size and structure as dimensioned in the Bible. The actual appearance, both inside and outside,is considered speculative. The floor space would be as much as 2 football fields and the volume would be more than 500 railroad boxcars. Lynn also built an "HO-scale" (1:78) that is on display at the Seven Wonders Museum near Mount St. Helens, Washington.

How did all the animals fit on Noah's Ark? by Jonathan Sarfati

http://www.answersingenesis.org/creation/v19/i2/animals.asp

Noah’s Ark Questions and Answers

http://www.answersingenesis.org/home/area/faq/noah.asp