Nobody is actually trying to land in Australia, they just want to get to Australian territorial waters and apply for asylum.  The only boat that actually got to Australia did it by mistake, they were heading to NZ, and we were in the way.  They pulled up into a harbour and waited for the authorities to come.  If they wanted to land undetected they could have gone few miles up or down the coast.  People do not want to come here undetected; it would be very hard to survive, they could not get a job without tax number, so unless they have millionaire relatives to support them it would be useless.