PURPOSE: To store a plural number of marine sensors and sequentially drop them with time intervals.

CONSTITUTION: A cylindrical container 11 is fixed in a storage recessed part B1 of a bottom part of an airframe B of an aircraft. In this container 11, three marine sensors 12a, 12b, 12c are longitudinally aligned and stored. The marine sensors 12a, 12b are held by inner covers 13, 13 and the marine sensor 12c is held by an outer cover 14 respectively. The inner covers 13, 13 and the outer cover 14 are respectively fixed by shear pins 15 which can be broken out. On the inner covers 13, 13 and the outer cover 14, gas exhaust nozzles 13a, 13a are respectively provided. On the inner cover 13, a powder cartridge 16 is provided. Additionally, also on the upper end part of the container 11, the powder cartridge 16 is provided. The powder cartiridge 16 is exploded by remote control. Pistons 19a, 19b, 19c capable of moving vertically are provided between the upper end of the inner cover 13 and the container 11 and the upper end of the marine sensors 12a, 12b, 12c.