Submarine & torpedo

Each ship has four submerged tubes set by gyroscope to fire abeam or at a pre-announced angle (five minutes to change setting). In the duel the enemy's position when the torpedo crosses his track is plotted; if the line crosses the outline, the torpedo card placed on the keel line gives a zone of chance 1-5 resolved by one die. In the fleet game the torpedo run is plotted against the target fleet's track and dividers proportional to speeds show which ship, if any, is hit. A torpedoed ship loses 500 points and all speed; defensive submarines hit 1 in 3 when awash within 1,000 yards, 1 in 6 if firing submerged.

A ship torpedoed loses 500 points and all her speed.

Ship torpedoes hit at 500 yds 1 in 6, 400 yds 2, 300 yds 3, under 300 yds 5 in 6 (foreign submerged tubes worse); ships under 5,000 tons torpedoed are sunk, larger waterlogged. Loaded above-water tubes may explode when their section is hit. Submarines plot courses on blank squares unseen, are tracked by the umpire, and are detected on the surface by double sixes by day.

At 500 yards one in six 400 yards two in six 300 yards three in six Under 300 yards five in six

Only at the Surface or Periscope Depth can the boat identify targets and fire torpedoes. Aircraft can only spot a surfaced boat. Destroyer attacks damage on 3+ at the Surface, 4+ at Periscope Depth, 5+ at 100m and 6 at 200m. Optional uncontrolled dive: at 200m with one hull token left, after surviving a destroyer attack, a roll of 1 implodes the boat.

There are four depth levels: Surface (1), Periscope Depth (2), 100 Meters (3) and 200 Meters (4).