46 CFR 144.515: One means of escape required.

Only one means of escape is required from a space where:

(a) The space has a deck area less than 30 square meters (322 square feet);

(b) There is no stove, heater, or other source of fire in the space;

(c) The means of escape is located as far as possible from a machinery space or fuel tank; and

(d) If an accommodation space, the single means of escape does not include a deck scuttle or a ladder.