Hi @amostafiz -
The only way I’ve managed to (nearly) sink a BlueBoat was by leaving the cross-tubes completely off their barbs, after running a cable through them and between the hulls. It took about 30minutes before I noticed, as I was operating in flat-calm water, but the boat was retrieved with a quick swim.
I’m too am curious what sort of catastrophic things you’re worried about? I routinely throw my test BlueBoats off of cliffs, beach them on rocks, and ram them into things - all in an effort to see what breaks. Other than the occasional prop hitting a rock, I’ve not yet been able to pierce the hulls themselves - the roto-molding process they are made with is identical to kayaks, which are nigh indestructible!
Tying a couple life-jackets to the top is one option, and the bigger risk to normal operations is flipping… which is also preventable!