Thanks guys for your replies. I did think that it was a little ridiculous that insurance would be required to run a submarine, I did assume that it was simply a case of needing to cover yourselves in this absurdly litigeous culture we live in. So in conclusion I hope to get the boat shipshape and tested before we come to the lido and yes it would be interesting to talk to the guy about his krick.
Certainly it is not the best designed boat but I think with a few tweaks principally on the sealing it could make a reliable and more importantly water tight boat.
Gyronuts, its great to hear from a fellow krick owner. Firstly my boat is still being built I just expect it to leak in certain places unless I improve the sealing. I too have thought about battery charging, but I think I will have to take off the front hatch to unplug the battery and connect to the charger (I have connected a 7.2V and 4.8V packs together in series). I thought about simply providing a charging jack without isolating the batteries from the circuit - but understood that on charging the batteries, the ESCs connected to the circuit could be damaged. As far as I see it with regards to the krick sub its the sealing that really lets it down. The first thing I have changed is to replace the bowden cables grease seal with rubber bellows from robbe. The hatch has had a silicon seal made, although no matter how much vaseline I applied to the lid, the silicone sealant seem to get stuck to it. The final sealing issue to deal with is the most difficult, the propshaft seal. I intend to tackle this by using a small "o" ring on the shaft as it leaves the prop tube which would be pressed into a small holder on the end of the shaft I think I would then use a thick oil maybe silicone oil for lubrication via the oiler points I have installed. It is a compromise but its the best solution I can think of.
Cheers
GoingDown