By Walt Hickey Never Let Go Til We’re Gone Deep sea currents and bacteria known to consume hundreds of pounds of iron per day have caused the Titanic to begin to deteriorate rapidly at its resting place at the bottom of the Atlantic. A new mission to the ship — discovered in 1985 after sinking in 1912 — seeks to quantify the degree of that deterioration over time. Since discovery, the forward mast has collapsed, the crow’s nest is gone, and the gym near the grand staircase has caved in. The mission — operated by OceanGate — is being funded by bringing about 40 people on as tourists who will operate sonar equipment and do other tasks in a five-person submersible. The tourists are paying between