there was the hiss and sickly smell of the insecticide bomb , the shrill hydraulic whine of the air-brakes and the landing-wheels being lowered , the dip of the plane 's nose , the tearing bump of the tyres on the runway , the ugly roar as the screws were reversed to slow the plane for the entrance bay , the rumbling progress over the tired grass plain towards the tarmac apron , the clang of the hatch being opened , and they were there .