If you visit Charlie's Carrot Surplus on Main Street, you will find that the clerk is missing her cat. Recover the cat and she will give you a crowbar as a reward. To get the cat :
(see related question)
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24 carrot island
If you find the lost cat for the clerk at the Carrot Surplus store, she will give you a crowbar as a reward. (see related questions)
the factory, get the crowbar to open the vent
The closed Carrot Cake Factory is to the right side of 24 Carrot Island. You will need a crowbar to get in through the sewer pipe at far right. (see related question)
Use the crowbar to open the sewage pipe tp enter the warehouse on 24 Carrot Island.
It is just right of the diner. The clerk there is missing her cat, and if you return it to her, she will give you a crowbar as a reward. (see related question)
The owner is in Charlie's Carrot Surplus store. (We do not learn if the woman is actually Charlie.) Once you return her cat, she will give you a crowbar.
Return the missing cat to her owner at Charlie's Carrot Surplus and you will receive a crowbar, which will come in handy when you next travel to the Carrot Cake Factory.
The only underground apparatus on 24 Carrot Island is the equipment stealing the carrots from the carrot farms. (They are used to make rocket fuel.) The operations of the evil Dr. Hare are all in the old Carrot Cake Factory to the far right of the island. You can get in through the sealed waste pipe if you have a crowbar. (see related question)
the crowbar is use to open the door on the sewer.
When you get the crowbar from charlie you go to the factory go past all the "things" until you reach the green water (:P yuck) you will find a sewage pipe. Its locked click it and if you have the crowbar your player will automatically use it!
you go to the icky water on the right side of the town and go all the way to the end and click on the tube thingy