Moonset Yep a little harder to fish off, would make a great reef though , although I think you are a little generous with the weight.
Operating empty weight 276,800 kg (610,000 lb) 252,200 kg (556,000 lb)
Maximum take-off weight 560,000 kg (1,200,000 lb) 590,000 kg (1,300,000 lb)
Cruising speed Mach 0.85
(903 km/h, 561 mph, 487 knots)
Maximum cruising speed Mach 0.89
(945 km/h, 587 mph, 510 knots)
Maximum speed Mach 0.96[118]
(1020 km/h, 634 mph, 551 knots)
http://en.wikipedia.org/wiki/Airbus_A380#Specifications
Squizy