I have finished Arif too,it is excellent working tug,BUT I had also a lot of problems with water in the hull. A LOT of water. First, I was thinking, it is picking up water by electric pump for monitors, but after first experience i plugged pump and water was still there.Around 2 quarts.And she picking up water very fast.I was lucky , all electronic was high, so it was dry. After removing large working deck,installed on double site tape, I find out water in deck construction. So this way water comming in.Problem is, working deck is very low, so I installed inside the hull new frame,just under existing deck. With large cover, installed on silicone. In one corner is drain pipe going out of hull, so area stays with out water.And this works.My next step was sealing all details going throe rear deck from inside.Again silicone is great seal for it. since this, I never had potential submarine with name Arif, it is good tug and very powerfull with two Speed 700 motors.SO I saved my investment of money and time to this tug just with additional waterproof cover under working deck. Sometimes is good idea think before, what will happend on maiden voyage