1) how deep can the Mako Mini sub go?
2) can i put bigger props on Mako Mini sub?
3) are the seals good or bad on the Mako Mini sub?
5) what kind of battery dose it use?

1)I have taken mine don to 11 feet without leaking..or it did start to leak but open the hull and let it air out, it will work after a few hours..
grease the crap out of the seal in the front!!!!!!
2)Why would you want too? it's fast enough!
3)Sucks..those seals suck due to a lack of grease..regrease them... :-) enough said there.
4) range is about 20 feet surface, the best was about 50feet
5) Alki batteries only..Nicad or Nims are too heavy..

about 30 minute runtime..
awsome to use at night!!!!!