A Level-3 hole works like two Level-2 holes. Let's call them "damage points".
1 damage point causes the lower deck to be filled with water in 85 seconds. 2 damage points can shink you in 43 seconds, 3 damage points in 28 seconds, etc.
The average bilge needs 14 seconds in order to clear the lower deck from water. This means that the average bilge can keep bucketing up to 6 damage points.
Move the sliders and check the calculated results.
Number of Level-2 holes: 0
Number of Level-3 holes: 0
Current water level: 0%