A memorial urn assembly for comingling remains from two containers includes a pair of containers such that each of the containers includes a perimeter wall defining an interior. The solid ink unit includes a meltable ink body having a longitudinal axis, a coupler support extending from the meltable ink body, and an opening in the coupler support that extends along a portion of the longitudinal axis of the solid ink body. 4 eV, and a response time T10 defined in the specification is not more than 0. The backup EDS transmission system also includes a pressure pulse receptor connected to a controller of blowout preventers and configured to measure a pressure in the mud column, at a subsea location.