Mirab bottom influence mine

This was a bottom influence mine believed developed in 1928 as the Soviet Union's first aircraft-laid bottom-influence mine. There have been, however, some doubts raised as to the legitimacy of this claim.

The early version of the Mirab mine was proven to be easy to detonate by shock, a problem corrected by directional condition.

Spacing between mines is a minimum of 200 ft (61 m).

Mirab is an abbreviation of the Russian phrase mina indusktsionnaya rechnaya aviatsionnaya, which...